Literature volume 2. Animals

General part

Beron P. 2005. Biodiversity of the Acari in Bulgaria. In: Petrova A. (ed.): Current state of Bulgarian biodiversity – problems and perspectives. Sofia (Bulgarian Biodiversity Platform), 153-171. (In Bulgarian).

Beron P., T. Daaliev, A. Jalov 2006. Caves and speleology in Bulgaria. Sofia (Pensoft). 507 p.

Biserkov V., B. Naumov, N. Tsankov, A. Stoyanov, B. Petrov, D. Dobrev, P. Stoev 2007. A field guide to amphibians and reptiles of Bulgaria. Sofia (Green Balkans). 195 p. (In Bulgarian).

Botev B., Tz. Peshev (eds.). 1985. Red Data Book of the People’s Republic of Bulgaria. Volume 2. Animals. Sofia (Publishing House of the Bulgarian Academy of Sciences). 183 p. (In Bulgarian).

Deltshev Ch., B. Petrov, P. Mitov 2005. Faunistic diversity of class Arachnida (non Acari) in Bulgaria – present state, importance and perspectives. In: Petrova A. (ed.): Current state of Bulgarian biodiversity – problems and perspectives. Sofia (Bulgarian Biodiversity Platform), 129-151. (In Bulgarian).

Golemansky V., M. Shishiniova 2001. Zoology of invertebrates. Sofia (Gera Art). 392 p. (In Bulgarian).

Golemansky V., M. Todorov, I. Pandurski, B. Georgiev, Y. Uzunov, V. Peneva, Ts. Konsulova, D. Kozhuharov, S. Andreev, P. Stoev 2005. Biodiversity of lower invertebrates in Bulgaria: present state, problems, perspectives. In: Petrova A. (ed.): Current state of Bulgarian biodiversity – problems and perspectives. Sofia (Bulgarian Biodiversity Platform), 105-127. (In Bulgarian).

Hilton-Taylor C. (compiler). 2000. 2000 IUCN Red List of Threatened Species. Gland, Switzerland and Cambridge, UK (IUCN).

Hristovich G.K. 1890. Materials towards the study of the Bulgarian fauna. A list of the birds of some localities in Bulgaria. – Sbornik za narodni umotvoreniya, nauka i knizhnina, 2: 185-225. (In Bulgarian).

Hubenov Z. 1996. Faunistic diversity of Bulgaria – Invertebrates. – Historia naturalis bulgarica, 6: 11-16. (In Bulgarian).

Hubenov Z. 2005a. Entomofaunistic diversity of Bulgaria. In: Petrova A. (ed.): Current state of Bulgarian biodiversity – problems and perspectives. Sofia (Bulgarian Biodiversity Platform), 173-198. (In Bulgarian).

Hubenov Z. 2005b. Malacofaunistic diversity of Bulgaria. In: Petrova A. (ed.): Current state of Bulgarian biodiversity – problems and perspectives. Sofia (Bulgarian Biodiversity Platform), 199-246. (In Bulgarian).

Iharos Gy. 1961. Grundlage der Tardigradenfauna Bulgariens. – Acta Zoologica Academiae Scientiarum Hungaricae, 7(1/2): 111-118.

IUCN 1966. International Red Data book of species threatened with extinction, IUCN, Gland, Switzerland and Cambridge, UK.

IUCN 1994. IUCN Red List Categories: Version 2.3. Gland, Switzerland (IUCN Species Survival Commission, IUCN).

IUCN 2001. IUCN Red List Categories and Criteria: Version 3.1. Gland, Switzerland and Cambridge, UK (IUCN Species Survival Commission, IUCN). ii+30 p.

IUCN 2003. Guidelines for Application of IUCN Red List Criteria at Regional Levels: Version 3.0. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN 2005. Guidelines for Using the IUCN Red List Categories and Criteria. IUCN. Available at: http://www.iucn.org/themes/ssc/red-lists.htm

Josifov M. 1988. Über den zoogeographischen Charakter der südeuropäischen Insektenfauna unter besonderer Berücksichtigung der Heteropteren. – Berichte des naturwissenschaftlich-medizinischen Vereins, Innsbruck, 75: 177-184.

Marinov T., V. Golemansky 1989. Second supplement to the Catalogue of the Bulgarian Black Sea Fauna. – Acta zoologica bulgarica, 37: 3- 33. (In Bulgarian).

Nankinov D. 2000. Threatened animals of Bulgaria. Natural conservation status and distribution in ecosystems. Sofia (Pensoft Publishers & Prof. Marin Drinov Academic Publishing House). 146 p.

Nankinov D. 2004. Second addition to the list of birds of Bulgaria. – Rivista italiana di Ornitologia, 73(2): 157-163.

Peshev Ts., D. Nankinov, D. Peshev 2003. The vertebrates of Bulgaria. An identification key. Sofia (Bulvest 2000). 414 p. (In Bulgarian).

Peshev Ts., D. Peshev, V. Popov 2004. Mammalia. – In: Markov G. (ed.): Fauna bulgarica. 27. Sofia (Editio academica “Marin Drinov”), 632 p. (In Bulgarian).

Simon N. 1966. Red Data Book. Volume 1. Mammalia: a compilation. Morges, Switzerland (IUCN).

Stefanov T. 2007. Fauna and distribution of fishes in Bulgaria. – In: Fet V., A. Popov (eds.): Biogeography and ecology of Bulgaria. Dordrecht (Springer), 109-139.

Velchev V. (ed.). 1984. Red Data Book of the People’s Republic of Bulgaria. Volume 1. Plants. Sofia (Publishing House of the Bulgarian Academy of Sciences). 447 p. (In Bulgarian).

Special part

Mammals

ABELENTSEV B. 1968. Fauna of Ukraine. Vol. 1. Mammals: Mustelids. Naukova Dumka. Kiev, 279 p. (in Russian).

ADAMOVICH V. 1989. The problem on the limitation of the synanthropy of the wolf and some of the aspects of its role in the rabies. In: (D. Bibikov (ed.) - Ecology, ethology and management of the populations of the wolf. Inst. of Evolutionary Morphology and Ecology of the Animals, VTO. Moscow, p. 9-13 (in Russian).

ANDREEV R., D. ZLATANOVA 2003. Status and number of the chamois in Stara Planina range. Sbornik nauchni dokladi: 75 godini Institut za Gorata – BAN, Sofia – p. 391-395 (in Bulgarian).

ARISTOV A., G. BARYSHNIKOV. 2001. The mammals of Russia and Adjacent territories. Carnovores and Pinnideds. Russian Academy of Sciences. Zoological Institute. St. Petersburg, 559 p. (in Rusian).

ATANASOV N. 1954. The otter in Bulgaria. - Lov I Ribarstvo, 8-9: 18 (in Bulgarian).

ATANASSOV N., Z. PESHEV 1063. Die Säugetiere Bulgariens. Säugetierkundliche Mitteilungen, 11(3): 101-112.

Atanassov, N., Z. Peschev. 1963. Die Sдugetiere Bulgariens. - Sдugetierk. Mitt. 11(3): 101-112.

Ausländer, D., Hellwing, S. 1957a. Observations e’cologiques sur les petits mammiferes des ecrans forestiers de protection de “Valul Traian” re’fe’rences spe’ciales concernant leur dynamique. - Trav. Mus. Hist. Nat. “Grigore Antipa”, 1: 11 - 139.

AVRAMOV S. 1995. Project: “ Investigation of the status of the Monk seal on the Bulgarian Black sea coast” Unpubl. report. Fondo para la foca del Mediterraneo & BSPB (in Bulgarian).

AVRAMOV, S. 1997 Project: "Investigation and conservation of the rare sea-cliff fauna on Bulgarian black sea coast ,1996-1997" (unpublished report). BSPB – Bird Life, Bulgaria.

Bashenina, N. V. Ecology of gray hamster (Cricetulus migratorius Pall) in European part of USSR. - Fauna and ecology of rodents, 4: 157 - 179 (In Russian).

Baumgart, W. 1975. An Horsten des Uhus (Bubo bubo) in Bulgarien. II. Der Uhu in Nordostbulgarien (Aves, Strigidae). - Zool. Abh. Mus. Tierk. Dresden, 33 (18): 251 - 275.

Beck A. 1995. Fecal analyses of European bat species. - Myotis, Bonn, 32-33: 109-119.

Benda p., Ivanova t., Horáček i., Hanák v., červený j., Gaisler j., Gueorguieva a., Petrov b., Vohralík V. 2003. Bats (Mammalia: Chiroptera) of the Eastern Mediterranean. Part 3. Review of bat distribution in Bulgaria. - Acta Soc. Zool. Bohem., 67: 245-357.

BEN-DAVID M. 1988. The biology and ecology of the marbled polecat (Vormela peregusna syriaca) in Israel. Thesis. Univ. of Tel-Aviv.

BEN-DAVID M. 1998. Delayed implantation in the marbled polecat, Vormela peregusna syriaca (Carnivora, Mustelidae): evidence from mating, parturition, and post-natal growth. Mammalia, 62 (2): 269-283.

BENTON, M. 2000. "Monachus monachus" (On-line), Animal Diversity Web. Accessed February 14, 2005 at http://animaldiversity.ummz.umich.edu/site/accounts/ information/Monachus_monachus.html.

Beron p., Beshkov v., Popov v., Vassilev m., Pandurska r. & Ivanova t. 2000. Biodiversity of Small Vertebrates (Pisces, Amphibia, Reptilia, Mammalia – Insectivora, Chiroptera, Lagomorpha and Rodentia) in the Rila National Park. Pp.: 333–360. In: Sakalian M. (ed.): Biological Diversity of the Rila National Park. Sofija: Pensoft, 650 p.

Beshkov V. A. 1993. The Bats of Bulgaria. In: Meine, C (ed.) Bulgaria’s Biological Divesity: Conservation Status and Needs Assessment. Vol. I and II. Washington, D. C.: Biodiversity Support Program, pp. 453 - 466.

BIBIKOV D., A. KUDAKTIN, A. FILIMONOV. 1985. Use of territory, dispersal. In: Bibikov (ed.). The Wolf. Nauka, Moscow, p. 415-431 (in Russian).

BIRKUN A., M. MOLDOVEANU, M. STANCIU, T. STANEV, B.ÖZTÜRK, A.KOMAKHIDZE. 1999. Tursiops truncatus Montagu, 1821. In: Black Sea Red Data Book. Cluwen Acad. Publisher, 413 p.

BIRKUN, A. Jr. 2002 Black Sea — Habitat loss and degradation. Pages 60-77. In: G. Notarbartolo di Sciara (Ed.), Cetaceans of the Mediterranean and Black Seas: State of knowledge and conservation strategies. A report to the ACCOBAMS Secretariat, Monaco, February 2002.

Buresch, I., 1917. On the Bat fauna (Chiroptera) of Bulgaria. - Magazine of Bul. Acad. Sci. and Art, XV:137-174.

Burton, M. 1987. Guide to Mammals of Britain and Europe. Tresaure: London. 79 p.

Buruldag, E. Kurtonur, C. 2001. Hibernation and postnatal development of the mouse-tailed dormouse, Myomimus roachi reared outdoor's in a cage. - Trakya University Journal of Scientific Research, Ser. B, vol. 2 (2): 179 - 186.

BYCHKOV V. 1985. Monachus monachus Hermann, 1779. In: BORODIN A. (ed.). Red data Book of USSR, Vol. I (second edition. Lesnaya Promyshlennost, p. 55-56 (in Russian).

CALINESCU R. 1931.Mammiferele României. Regia M.O., Imprimeria Natională. Bucureşti, p. 103.

CEM ORKUN KIRAÇ 2001. Witnessing the Monk seal’s extinction in Black sea. The Monachus Guardian, 4(2), Nov. 2001. (On line, accessed February 17 at http://www.monachus-guardian.org).

DEDE, A. 1999. Turk boazlar sisteminde yasayan deniz memelileri populasyonlari uzerine arastimalar. Doctoral Thesis, Istanbul University. 62 pp. [In Turkish].

Dondini G., S. Vergari. 2000. Carnivory in the greater noctule bat (Nyctalus lasiopterus) in Italy.- Journal of Zoology, London, 251: 233-236.

DRENSKI P., 1926. The otter (Lutra vulgaris) as a pest for the fish and the fishery – Lovets, 7: 12-14 (in Bulgarian).

DUTSOV, A. 2003. Population Status and Distribution of Chamois (Rupicapra rupicapra balcanica Bolkay, 1925 in Pirin National Park. In: Proceedings of the International conference – 75 Years Forestry Institute. Bulg. Acad. Sci., Sofia, pp. 429 – 433.

ERLINGE S. 1967. Home range of the otter, Lutra lutra L. in Southern Sweden. - Oikos, 18 (2):186-209.

ERLINGE S. 1968. Тerritoriality of the otter Lutra lutra (L.). - Oikos: 19 (1): 81-98.

GENOV P., A. DUTSOV, B. DACHEV, I. PETROV, V. VASILEV. 2005. Distribution, number and use of the large carnivores in Bulgaria. Nauka za Gorata, 1:61-70 (in Bulgarian).

GENOV P., A. STAVRAKEV, A. ATANASOV. 1990. Frequency, seasonal and daily dynamics of the wolfs’ attacks on domestic animals for the period 1984 – 1988. Univ. of Plovdiv “P. Hilendarski”. Scientific papers, Biology, 28(6): 203 – 213 (in Bulgarian).

GENOV P., R. GUNCHEV, B. KIROV, B. DACHEV B. ATANASOV. 2003. distribution and number of the chamois in Bulgaria. Proceedings – 75 years Forestry Inst. – Bulg. Acad. Sci. Sofia, p. 421- 428 (in Bulgarian).

GENOV, P. AND G. MASSEI, 1989. The distribution and status of Rupicapra rupicapra balcanica (Bolkay, 1925) in Bulgaria. World Conf. on Mountain Ungulates, Camerino (MC), 15 p.

GENOV, P., V. KOSTOVA, G. MASSEI. 1996. Litter size and population dynamics of the wolf (Canis lupus L.) in Bulgaria in the last century (summary). in: (N. Botev, ed.). XX Congress The game and the Man, Sofia - 1995. Proceedings. Pensoft, p. 216.

GEORGIEV, D. G., 2005. Habitats of the Otter (Lutra lutra L.) in some Regions of Southern Bulgaria - IUCN Otter Spec. Group Bull., 22 (1): 1-6

GEORGIEV, D. G., 2006. Diet of the Otter Lutra lutra in different Habitats of Southern Bulgaria - IUCN Otter Spec. Group Bull., 23 (1): 4-10.

GEORGIEV, D. G., 2007. Otter (lutra lutra l.) mortality In Southern Bulgaria - IUCN Otter Spec. Group Bull., 24:5-10.

GEPTNER V., A. SLUDSKIY. 1972. Mammals of the Soviet Union, Vol. 2 (part 2), Carnivores (hyenas and cats). Publ. House “Vyshaya shkola. Moscow, 551p (in Russian).

GEPTNER V., N. NAUMOV, P, JURGENSON, A. SLUDSKIY, A. CHIRKOVA, A. BANNIKOV. 1967. Mammals of the soviet Union, Vol. II(part 1). Sirenians and Carnivores (V. Geptner, N. Naumov, eds.). Publ. House “Vyshaya shkola. Moscow, 1004 p (in Russian).

GLAVNOE UPRAVLENIA OHOTNICHEGO HOZIAYSTVA I ZAPOVEDNIKOV PRI SM RSFSR. 1987. Methodic instructions on wolf account by home-range mapping. GUOHZ, Moscow, 30 pp (in Russian).

Gorecki, A. , Grygielska, M. 1975. Consumption and utilization of natural foods by the common hamster. - Acta Theriol., 20 (18): 237 - 246.

Gorecki, A. 1977. Energy flow through the Common Hamster population . - Acta Theriol., 22 (2): 25 - 66.

GRIGOROV G. 1986. Distribution, number and use of the stone marten (Martes foina Erxl.), the pine marten (Martes martes L.) and the badger (Meles meles L.) in Bulgaria - Gorskostopanska nauka, 5: 59-67 (in Bulgarian).

Gromov I. M., A. A. Gureev, G. A. Novikov, I. I. Sokolov, P. P. Strelkov, K. K. Chapskii. 1963. Mammal fauna of the USSR, vol. I and II. Moscow-Leningrad, 1069 p., (In Russian)

GRUBAČ B. 2000. The lynx Lynx lynx (Linnaeus, 1758) in Serbia. – Protection of Nature, Belgrade, 52 (1): 151-173.

Grulich, I. 1975. Zum Verbreitungsgebiet der Art Cricetus cricetus (Mamm.) in der Tschechoslowakei. - Zoologicke Listy, 24 (3): 197 - 222.

Grulich, I. 1978. Standorte des Hamsters (Cricetus cricetus L., Rodentia, Mammalia) in der Ostslowakei. - Acta Sc. Nat. Brno, 12 (1): 1 - 42.

Grulich, I. 1986. The reproduction of Cricetus cricetus (Rodentia) in Czechoslovakia. - Acta Sc. Nat. Brno, 20 (5-6): 1 - 56.

GUNCHEV R. 1980. Distribution and number of the chamois in Stara Planina range - Gorsko stopanstvo, 4: 43-46 (in Bulgarian).

GUNCHEV R. 1989. Survey on the number, the biology and the ecology of the Brown bear (Ursus arctos L.) in Stara Planina range. Ph. D. thesis. High Forestry Institute. Sofia, 128 pp (in Bulgarian) .

GUNCHEV R. 2001. Establishing of an action plan for the protection and the restoration of the population of the chamois in National Park Central Balkan, (report, Direction of the NP Central Balkan), 42 pp. (in Bulgarian).

Hamar, M. , Sutova, M. 1963. Studiul ecologic al rozatoarelos (Glires) din Baragan si Dobrogea. - Analele sectieti de protectia plantelor, 1: 195-216.

Hanák V., P. Benda, M. Ruedi, I. Horáček, T. S. Sofianidu. 2001. Bats (Mammalia: Chiroptera) of the Eastern Mediterranean. Part 2. Review of bat distribution in Greece. - Acta Soc. Zool. Bohem., 65: 279-346.

Heinrich G. 1936. Ueber die von mir im Jahre 1935 in Bulgarien gesammelten Säugetiere. - Mitt. Königl. Wiss. Inst., Sofia, 9: 33–48.

Horaček, I., J. Cerveny, A. Tausl, D. Vitek. 1974. Notes on the mammal fauna of Bulgaria (Insectivora, Chiroptera, Rodentia).- Vestn. Ceskoslov. Spol. Zool., Praha, 38 (1): 19-31.

HRISTOVICH K. 1939. The chamois – Priroda , 4: 1-3 (in Bulgarian).

Ionescu, V. 1968. Vertebratele din Romania. Bucuresti, 496 p.

ISRAËLS l. 1992. Thirty years of Mediterranean monk seal protection, a review. Nederlandische Commissie voor Internationale Natuurbescherming. Mededelingen, No.28:1-65.

IVANOV, V. 1988. Observations on the behaviour and biology of the wolf (Canis lupus L., 1758) in Ihtimanska Sredna Gora mountain - Ecology. Sofia, 21: 25-33.

Ivanova T. 1998. First data on bats of the Central Balkan Mts., Bulgaria. – Vespertilio, 3: 29-36.

Ivanova T. 2005. Important Bat Underground Habitats (IBUH) in Bulgaria. - Acta zool. bulg., 57 (2): 197-206.

Ivanova T., A. Guerguieva. 2005. Bats (Mammalia: Chiroptera) of the Eastern Rhodopes (Bulgaria and Greece) – species diversity, zoogeography and faunal patterns. - In: Beron P., Popov A. (eds). Biodiversity of Bulgaria. 2. Biodiversity of Eastern Rhodopes (Bulgaria and Greece). Pensoft & Nat. Mus. Natur. Hist., Sofia, 907-927.

Kerth G., K. Safi and B. König. 2002. Mean colony relatedness is a poor predictor of colony structure and female philopatry in the communally breeding Bechstein’s bat (Myotis bechsteinii). - Behavioral Ecology and Sociobiology, 52: 203-210.

Kerth G., Е. Petit. 2005: Colonization and dispersal in a social species, the Bechstein’s bat (Myotis bechsteinii). - Molecular Ecology, 14: 3943–3950.

KIROV B. (rapport non publié). Etat et exploitation de l’ours brun (Ursus arctos L.) dans la partie de Dobrostan-Prespa des Rhodopes. Séminaire sur les petites population de mammifères menacés, Convention de Berne, Sofia, 1993: manuscript 17 pp.

KLEINENBERG S. 1956. The Mammals of the Black and the Azov seas. AN USSR Publ. House. Moscow, 288 pp (in Russian).

KOVACHEV V. 1925. The Mammalian fauna of Bulgaria. Trudove na Bulgarskia nauchen zemedelskostopanski inst., 11, 68 p (in Bulgarian).

Kovatchev, V. T. 1925. The mammalian fauna in Bulgaria. - Trav. Bulg. Inst. Agr., 11: 1 - 68 (In Bulgarian).

KUMERLOEVE, H. 1975. Die Saugetiere (Mammalia) der Turkei - Veroeff. Zool. Staatssamml. Muenchen18: 69-158.

Kurtonur, C., Ozkan, B. 1991. New records of Myomimus roachi (Bate, 1937) from Turkish Thrace (Mammalia: Rodentia: Gliridae). - Senckenbergiana biol., 71: 239 - 244; Frankfurt am Main.

LEPŞI.J. 1925. Coasta de argint. Analele Dobrogei, An. V. Cernănti, 50 p.

LOBACHEV Y. 1978. European mink, Mustela lutreola. In: Red Data Book of the Kazakh SSR. Kaynar, Alma-Ati, pp. 46-47 (in Russian).

Lozan M. N., 1971. Rodents of Moldavia Vol. 1 Stiinca, Kisinev,168 p. (In Russian)

MARAKOV S., L. POPOV. 1983. Monk-seal. Red Data Book of the Russian SFSR. ROSSELHOZIZDAT. Moscow, pp. 74-75 (in Russian).

MARAN T. H. HENTTONEN. 1995. Why is the European mink (Mustela lutreola) disappearing? A review of the process and hypotheses - Ann. Zool. Fennici, 32: 47-54.

Markov G. 1957. Untersuchungen uber die Systematik von Citellus citellus L. - Bull. de l'Inst. Zool. de l'Academie des Sciences de Bulgarie, Sofia, 6:453-490 (In Bulgarian, German summary).

Markov G. 1960. Beitrag zur Untersuchung der Hamster (Cricetinae) in Bulgarien. - Bull. de l'Inst. Zool. de l'Acad. Sci. Bulg., Sofia, 9:293-304 (In Bulgarian, German summary).

Markov G. 1964. Insectivores and rodents in Thrace. - Fauna na Trakia 1:19-53 (In Bulgarian, German summary).

MARKOV, G., F. SUCHENTRUNK, A. HAIDEN, A. KUBER, M. HERMAN 2003 a. Genetic diversity and similarity of the populations of the wildcat (Felis silvestris silvestris) in Europe. In: Proceedings of the International conference – 75 Years Forestry Institute. Bulg. Acad. Sci., Sofia, pp. 404-411 (in Bulgarian).

MARKOV, G., F. SUCHENTRUNK, A. HAIDEN, A. KUBER, M. HERMAN 2003 b. The Wildcat (Felis silvestris silvestris ) and the domestic cat (Felis silvestris f. domestica) in Europe: diversity and similarity in their biochemical and genetic alloenzim characteristic. In: Proceedings of the International conference – 75 Years Forestry Institute. Bulg. Acad. Sci., Sofia, pp. 397 - 403 (in Bulgarian).

MARKOV, G., F. SUCHENTRUNK, A. HAIDEN. 2001. Population diversity and similarity of the biochemical and genetic characteristic of the wildcat (Felis silvestris L.) in Bulgaria. In: Third Balcan Scientific conference “ Study, conservation and conservation of the forest resources”, 2-6 October, Sofia. Proceedings, Vol. 3: 500-507. (In Bulgarian).

MASI, A. 2000. "Phocoena phocoena" (On-line), Animal Diversity Web. Accessed January 25, 2005 at http://animaldiversity.ummz.umich.edu/site/accounts/ information/Phocoena_phocoena.html.

MATJUSHKIN E. 1974. The Lynx. Series – The larges carnivores. Bibloteka liubitelia prirody. Lesnaya promyshlennost. Noscow, 62 p (in Rusian).

MICHEV T. 1985. Monk seal - Monachus monachus Hermann, 1779. In: Red Data Book v Bulgaria, Vol. 2 – Animals. Publ. House of the Bulg. Acad. Sci. Sofia, 138-139 (in Bulgarian).

Miller, G. S. 1912. Catalogue of the mammals of western Europe. London: Br. Mus. Nat. Hist., 1019 p.

MIRCHEV R., K. ANDONOV. 2003. The chamois (Rupicapra rupicapra balcanica Bolkay, 1925) in Rila mountain – recent distribution and number. Proceedings – 75 years Forestry Inst. – Bulg. Acad. Sci. Sofia, p. 413 - 419 (in Bulgarian).

Mitev I. 1995. Fledermäuse in der Nahrung bulgarischer Greivogel und Eulen.- Nyctalus (N.F.), 5: 409-416.

MÜLLER, H.-U., C. MARTIN&P. DIETHELM. 1976. La loutre. Zurich, 48 pp.

Nechay G., Hamar M., Grulich I. 1977. The common hamster (Cricetus cricetus L.): A review. EPPO Bull. 7 (2): 255 - 276.

Niethammer J., Krapp F. (eds.). Handbuch der Saugetiere Europas, vol. 2. Akad. Vrlg. Ges., Wiesbaden, pp. 1 -50.

Nikitina N. A. 1989. Order Rodentia - rodents. In: Kutcheruk, V. V. (ed.) Medical theriology (rodents, carnivores, bats). Moscou, 269 p. (In Russian).

NOTARBARTOLO DI SCIARA G. 2002. Summary. In: G. Notarbartolo di Sciara (Ed.), Cetaceans of the Mediterranean and Black Seas: state of knowledge and conservation strategies. A report to the ACCOBAMS Secretariat, Monaco, February 2002. Section 1, 5p.

NOWAK, R. 1999. Walker's Mammals of the World, 6th Ed. Vol II. Baltimore. John Hopkins University Press.

Ognev S. I. 1948. Mammals of the U.S.S.R. and Adjacent Countries. Volume VI. Rodents. Pp. viii+559 (In Russian)

Pakiz V. I. 1958. Distribution of European souslic in Modavian SSR and some data on its ecology. - Zool. Jour., 37 (1): 105 - 120. (In Russian).

Pandurska R. 2002. Bats in Bulgaria, with an emphasis on Geoffroy’s bat (Myotis emarginatus).- Bat Research News, 43 (1): 1-4.

Pandurska R., T. Ivanova. 2003. Distribution and present status of Barbastella barbastellus (Schreber, 1774) in Bulgaria. - Nyctalus (N. F.), Berlin, 8 (6): 626–629.

Pandurska R., V. Beshkov. 1998. Bats (Chiroptera) of high mountains of Southern Bulgaria. In: Carbonell J- P. & Stamenov I. N. (eds)., Observatoire de montagne de Moussala, Symposium international, Borovets, Bulgaria, 15-17. 10. 1997, 135-140.

Paspalev, G., Ts. Peshev. 1957. Contribution on the ecology of Citellus citellus L. in Bulgaria. - Bull. Soil Inst. Bulg. Acad. Sci., 4: 175 - 189 (In Bulgarian).

PAUNOVIĆ M., MILENCOVIC M., IVANOVIĆ-VLADOVIĆ, C. 2001. The lynx populations in the Federal Republic of Yugoslavia. – In: Breitenmoser-Wursten C. and Breitenmoser U. (Eds.) The Balkan lynx population – History, Recent Knowledge on its Status and Concervation Needs. Kora Bericht. Muri, 7: 12-18.

Paunović M., R. Pandurska, T. Ivanova, B. Karapanda. 2003. Present knowledge of distribution and status of Barbastella barbastellus (Schreber, 1774) (Chiroptera: Vespertilionidae) on the Balkan peninsula.- Nyctalus (N. F.), Berlin, 8 (6), 633-638.

PESHEV D., V. DELOV, A. VASSILEV. 2005. Preliminary stubby of the negative factors for the sea mammals in the Bulgarian aquatory of the Black sea. In: Biodiversity, Ecosystems Global Changes. First National Conference in Ecology. PETEKSTON. Sofia, pp. 303-308.

Peshev Ts. 1955. [Investigations in systematics and biology of Citellus citellus L. in Bulgaria]. - Bull. Inst. Zool. Mus. 4-5:277-327 (In Bulgarian).

Peshev Ts., D. Peshev, V. Popov. 2004. The Fauna of Bulgaria. vol. 27. Mammalia. Ed. Bulg. Acad. Sci. Sofia, 632 p. (In Bulgarian, English summary).

Peshev Ts., T. Dinev and V. Angelova. 1960. [Myomimus persinatus Ogn. (Myoxidae): a new species of rodent for the fauna of Europe]. - Bull. Inst. Zool. Mus. 9:305-314 (In Bulgarian).

Peshev Ts., V. Angelova and T. Dinev. 1960. [Cricetulus migratorius Pall. (Cricetidae): a new species of mammal for the fauna of Bulgaria]. - Bull. Inst. Zool. Acad. Sci. Bulg., 9: 393-396 (In Bulgarian).

PETROV A. 1965. European mink- Priroda I Znanie. Sofia, 10:14.

Petrov B. 1957. Studies on the rodents from Dobrudzha, their economical importance and methods for control. - Journ. Sci. Inst. Min. Agr., 2: 81 - 98 (In Bulgarian).

Petrov B. 1997. Research on bats (Mammallia, Chiroptera) in Kresna Gorge, SW Bulgaria: species composition, distribution, biology, and conservation. – University of Sofia “St. Kliment Ohridski”, Faculty of Biology, Department of Ecology and Environmental Protection, M. Sci. thesis, 58 p. (In Bulgarian).

Petrov B. 2006. Distributionand status of Myotis bechsteinii in Bulgaria (Chiroptera: Vespertilionidae).- Lynx n.s., Praha, 37: 179-195.

Petrov, B. 2001. Bats (Mammalia: Chiroptera) in Kresna Gorge, SW Bulgaria. In: Beron, P. (ed.) Biodiversity of Kresna Gorge (SW Bulgaria): 325 - 330. (In Bulgarian, English summary)

PETROV I. 1991. The Wildcat (Felis silvestris Schreber, 1777: Mammalia, Felidae) in Bulgaria. Unpubl. Ph D Thesis. Bulg. Acad. Sci. – Inst. of Zoology. Sofia (in Bulgarian).

PIERPAOLI M., Z. S. BIROM, HERRMANN, K. HUPE, M, FERNANDES, B. RAGNI, L. SZEMETHY, E. RANDI 2003. Genetic distinction of wildcat (Felis silvestris) populations in Europe, and hybridization with domestic cats in Hungary. Molecular Ecology 12, p 2585-2598.

Popov V., I. Pandurski, R. Pandurska-Whitcher, V. Beshkov. 2006. Small mammals (Insectivora, Chiroptera, Lagomorpha, Rodentia) in the area of Strandzha Mountain, South-Eastern Bulgaria. In: Pp.: 87–104. In: Chipev N. (ed.): Challenges in Establishment and Management of a Trans-Border Biosphere Reserve Between Bulgaria and Turkey in Stranja Mountain, Bourgas, 10–13 November 2005. Burgas.

Popov V., Ivanova T. 2002. Comparative craniometrical analysis and distributional patterns of mediumsized horseshoe bats (Chiroptera: Rhinolophidae) in Bulgaria. - Folia Zool., 51: 187–200.

PRIKLONSKY, S.G., M.V. DIDORCHOOK. 2000. The Marten (Martes martes): number, dynamic and diet in Europaen Russia. - V.P. Ivanchev (ed.). Proceeedings of the Oka state biosphere reserve, Ryazan 20: 338-346 (in Russian).

PROMBERGER, C., O. IONESCU, L. PETRE, C. ROSCHAK, P. SURTH, B. FURPASS, L. TODICESCU, A. SANDOR, M. MINCA, T. STAN, H. HOMM, G. PREDOIU, M. SCURTU. 1997. Carpatian Large Carnivore Project. Annual Report 1996 - 1997. Institutul de cercetari si amenajari silvice. Bucuresti.

ROSEL, P.E., FRANTZIS, A., LOCKYER, C. and KOMMENOU, A. 2003. Source of Aegean Sea harbour porpoises. Mar. Ecol. Prog. Ser. 247: 257-261.

Rossolimo O. L. 1076. Systematic status of mouse-tailed dormouse Myomimus personatus (Mammalia, Myoxidae) from Bulgaria. Zool. Journ., 55 (10) : 1515 - 1525 (In Russian).

RYABOV L. 1985. Consequence form the disturbance of the wolf population. In: Bibikov D. (ed.) – The Wolf. Nauka, Moscow, pp. 431-446 (in Russian).

SAINT GIRONS M.-Ch. 1992. Répartition actuelle du vison sauvage Mustela lutreola, en Europe. XV-ème Coll. Francophone de Mammalogie: “Ecologie, comportement, evolution des carnivores. Encyclopédie des carnivores de France, hors-série. Soc. Francaise pour l’étude et la protection des mammifères, pp. 87-88.

Schapp, B. 1968. The fauna of micromammals from Valul-lui-Traian (Dobrudja) in the years 1958-1962, according to Asio otus (L.) pellets. - Trav. Mus. Hist. Nat. “Grigore Antipa”, 2 (2): 1045-1063.

SCHROEPFER R.., WIEGANG P., HOGREFE H. 1997. The implications of territoriality for the social system of the European pine marten (Martes martes L., 1758 - Z. fur Saugetierkunde, 62:209-218.

Schunger I., Ch. Dietz, D. Merdschanova, S. Merdschanov, K. Christov, I. Borissov, S. Staneva and B. Petrov. 2004. Swarming of bats (Chiroptera, Mammalia) in the Vodnite Dupki Cave (Central Balkan National Park, Bulgaria). – Acta zoologica bulgarica, 56 (3): 323-330.

Seluga K. 1996. Untersuchungen zur Bestandissituation ind Ökologie des Feldhamster, Cricetus cricetus L., 1758, in den östlichen Bundesländern. Halle (Saale), Martin-Luther. Univ. 106 p.

Simeonov S. 1964. New locality of Cricetulus migratorius Pall. in Bulgaria. - Ann. Univ. Sofia, 57(1):117-118 (In Bulgarian).

Simeonov S. 1966. Forschungen über die winternahrung der Waldohreule (Asio otus L.) in North-Bulgarien. - Fragmenta Balcanica. - Mus. Maced. Sci. Natur., Skopje, 5, 23 (133): 169 - 173 (In Bulgarian).

Simeonov S. 1978. Über die Nahrung der Schleiereule (Tyto alba Scopoli) in einigen Gegenden Bulgariens. - Ekologia, 4:65-71(In Bulgarian).

Simeonov S. D. 1963. Materials on the food of the Long-Earred Owl (Asio otus L.) in certain regions of Bulgaria. - Ann. Univ. Sofia, 57,1:107-115 (In Bulgarian).

Simeonov S. D. 1985. A study on nest biology and food range of the Tawny Owl (Strix aluco L.) in Bulgaria. - Ekologia, 17:42-48 (In Bulgarian).

Simeonov S. D. and Ts. Petrov. 1986. New materials on the food of the Long-Earred Owl (Asio otus L.) beyond the nidificating period in Bulgaria. - Ekologia, 18:27-32 (In Bulgarian).

Simeonov S. D. and Z. N. Boev. 1988. A study of the nutritive spectrum of the Eagle Owl (Bubo bubo L.) in Bulgaria. - Ekologia, 21:47-57 (In Bulgarian).

SIMMONDS M. 2003. The Black Sea Bottlenose Dolphin - What Next? Submitted to the Scientific Committee of the International Whaling Commission. Ref: SC/55/SM12. 10 pages.

SMIRNOV V., N. KORYTIN. 1985. Age structure and sex ratio: In: Bibikov D. (ed.) – The Wolf. Nauka, Moscow, pp. 389-408 (in Russian).

SMITH C., A. VAN WIJNGAARDEN. 1981. Threatened mammals in Europe. European Commetee for the Conseration of Nature and Natural Resources. Council of Europe. Wiesbaden, 259 pp.

SPASSOV N. 1985. The European mink, Mustela lutreola (L. 1761). In: Red data Book of Bulgaria, Vol. 2 – Animals. Publ. House of the Bulg. Acad. Sci., Sofia, pp. 134-135 (in Bulgarian).

SPASSOV N. 1999. Nouvelles donnees sur la presence et le statut du Putois marbre (Vormela peregusna) et du Putois siberien (Mustela eversmanni) en Dobroudja bulgare - Branta. Le Balkan, 3:27.

SPASSOV N. 2003. The Brown Bear in the southern Balkans. In: Krystufek, B., B. Flajsman, Huw Griffiths (eds.). Chapter 9.Living with Bears, A large European carnivore in a shrinking world. Ekoforum, Ljubljana, pp. 229-244.

SPASSOV N. Evolution and distribution of the Western polecat and the Siberian polecat black - Priroda. Sofia, 6: 32-39 (in Bulgarian).

SPASSOV N., G. SPIRIDONOV 2006. Status of the large mammals (Macromammalia) in Western Rhodopes, Bulgaria. In P. Beron (ed.) Biodiversity of Bulgaria. 3. Biodiversity of Western Rhodopes (Bulgaria and Greece). Pensoft & Nat. Mus. Natur. Hist., Sofia, pp. 959-974.

SPASSOV N., G. SPIRIDONOV. 1985. The Pine Marten, Martes martes L.1758; The Steppe Polecat, Mustela eversmanni Lesson, 1827; The Marbled Polecat, Vormela peregusna Guldenstaedt, 1770; The Otter, Lutra lutra L., 1758. In: Red Data Book of Bulgaria. Vol.2, Animals, Publ. House of the Bulgarian Acad. of Sci., 1985 (in Bulgarian).

SPASSOV N., G. SPIRIDONOV. 1993. Vormela peregusna Gueld., 1770- Tigeriltiss. In: Handbuch der Säugetiere Europas. Aula Verlag GmbH, Wiesbaden. Band 5/II (Carnivora): 817-854.

SPASSOV N., K. Georgiev, N. Ivanova, V. Ivanov. 2002. Study of the status of marbled polecat (Vormela peregusna peregusna Guld.) in Western and North-Eastern Bulgaria with data on the status of its potential main prey species and competitors - Historia naturalis bulgarica, 14: 123-140.

SPASSOV N., N. IVANOVA, F. BEGO, S. HRISTOVSKY, B. MIHOVA. 2001. Status and conservation of the wolf in the Southern Balkans - Wolf Print, 10:17-19.

SPASSOV N., SPIRIDONOV G., PENEV G. 2006. The Discovery of an Extinct Species: Data for the Recent Presence of the Lynx (Lynx lynx L.) in Bulgaria and discussion of its status since 1941. - Historia naturalis bulgarica, 17:167-176.

SPASSOV N., V. IVANOV (unpubl. report). Survey of the status of the otter, Lutra lutra L. in the Strandja Natural Park and elaboration of an Action plan for the management of its population (1994 – 1996). Records of the Ministry of the Environments and Waters on the project: Management plan of the Strandja Natural Park. Sofia (in Bulgarian).

SPASSOV N., V. Simeonovski, G. SPIRIDONOV 1997. The Wild Cat (Felis silvestris Schr.) and the Feral Domestic cat: Problems of the Coloration Patterns, Taxonomy, Identification of the Hybrids and Purity of the Wild Population - Historia naturalis bulgarica. Sofia, 8: 101-118.

SPASSOV, N., MIHAILOV, H., GEORGIEV, K. & IVANOV, V. 2000a. Status of the large mammals (Macromammalia). In: Biodiversity of Rila National Park. Pensoft. Sofia, pp. 389 – 428.

SPASSOV, N., NINOV, N., GEORGIEV, K., GUNCHEV, R. & IVANOV, V. 2000b. Status of the large mammals (Macromammalia). In: Biodiversity of Central Balkan National Park. Pensoft. Sofia, pp. 425 – 490.

SPIRIDONOV G. & SPASSOV, N. 1998. Large mammals (Macromammalia) of Bulgaria. In: Meine, C. (ed.) Bulgaria’s Biological Diversity: Conservation and Status Needs Assessment. Washington D. C.: Biodiversity Support Program, pp. 467 - 483. (original Bulgarian version – 1993).

SPIRIDONOV G. 1970. Amnisty for the Lynx – Priroda i Znanie, 6-7: 56-57 (in Bulgarian).

SPIRIDONOV G. 1985. Chamois – Rupicapra rupicapra L., 1758. In: Red Data Book of Bulgaria, Publ. House of the Bulg. Acad. Sci., 139 p.

SPIRIDONOV G., I. RAEV. 2006. A strategy for conservation of virgin forests in Bulgaria: Conceptual paper. In: Virgin forests in Bulgaria. Sc. Edit. P. Veen, I. Raev. Royal Dutch Society for Nature protection, Ministry of Enviroment and Water-EEA: 111-123.

SPIRIDONOV G., N. SPASSOV 2005. Species Richness of the Bulgarian Mammal Fauna and Directions for its Conservation. In: Petrova V. (ed.). Current state of Bulgarian biodiversity – problems and perspectives. Bulgarian Bioplatform, Sofia, 313 – 324.

SPIRIDONOV G., N. SPASSOV. 1985. The Wolf, Canis lupus L., 1758: The Lynx Felis lynx L., 1758; The Bear - Ursus arctos L., 1758. In: Red Data Book of Bulgaria. Vol.2, Animals, Publ. House of the Bulgarian Acad. of Sci., 1985.

SPIRIDONOV, G. & GENOV, P. 1997. Bulgaria (pp. 86 - 89). In: Shackleton, D. (ed.) – Wild Sheep and Goats and their Relatives. IUCN/SSC Caprinae Specialists Group. IUCN. Gland, 390.

SPIRIDONOV, G. & SPASSOV, N. 1998. Large mammals (Macromammalia) of Bulgaria. In Meine, C. (ed.) Bulgaria`s Biological Diversity: Status and Conservation Needs Assesment. Washington D.C.: Biodiversity Support Program, pp. 467 – 483 (Bulgarian version - 1993).

SPIRIDONOV, G. 2003. The Mammals in Rila Monastery Nature Park and Their Conservation. In: Rapid Ecological Assessment of Rila Monastery Nature Park. USAID, MoEW, Republic of Bulgaria: 163-165.

SPIRIDONOV, G., N. SPASSOV. 1989. The Otter in Bulgaria, its state and conservation. – Historia naturalis bulgarica 1:57-63.

SPIRIDONOV, G., V. DIMITROV 2006. Distribution area of the Otter, Lutra lutra. Natural State of the rivers in Bulgaria. In: Indicative map of the Pan-European network for Southeastern Europe. CKFF-ECNC. Tilburg, Netherlands, 46 pp.

STANEV Ts. 1996. Distribution and number of the dolphins in the Bulgarian Black sea aquatory - Proc. of the Inst. of fisheries – Varna. 24:177-182.

Straka F. 1961. Contribution on the bioecology and control of European souslic (Citellus citellusL.) in Bulgaria. - Bull. Cent. Sci. Inst. Plant Prot.,1: 25 - 63.

STUBBE M. 1993 Martes martes – Baummarder, Martes foina – Steinmarder. In: Handbuch der Saugetiere Europas. Aula Verlag GmbH, Wiesbaden. Band 5/I (Carnivora), pp. 374-480.

Stubbe, M., Seluga, K., Weidling, A. 1997. Situation and ecology of the European hamster Cricetus cricetus (L., 1758). - Tiere im Konflikt, 5 : 5 - 60.

TIUFEKCHIEV A. 1978. Survey on the chamois (Rupicapra rupicapraL.) in the region of Pirin mountain. Ph D Thesis, VLTI, Sofia.

Topal G. 2001. Myotis emarginatus (Geoffroy, 1806) – Wimperfledermaus. In: J. Niethamer and F. Krapp (eds.), Handbuch der Säugetiere Europas, Aula-Verlag, Wiebelsheim, 4: 369-404.

VALCHEV. K., A. OBRETENOV AND P. GENOV, 2005. Current Problems In Management of Balkan Chamois (Rupicapra rupicapra balcanica Bolkay, 1925) in Bulgaria. In: Herausgeber Prof. Dr. Michael Stubbe, Beiträge zur Jagd – und Wildforschung, Band 30: 373-382.

Vinogradov B. S., I. M. Gromov. 1952. Rodents of USSR. Moscow-Leningrad, 298 p., (In Russian)

Vohralik V. 1974. Biology and reproduction of the common hamster Cricetus cricetus (L.). - Vest. Cs. spol. zool., 38 (3): 228 - 240.

Weidling A. 1996. Zur Okologie des Feldhamsters Cricetus cricetus L., 1758 im Nordharzvorland. Halle (Saale), Martin-Luther Univ., 120 p.

WOLSAN M. 1993 Mustela eversmanni – Steppeniltis. In: Handbuch der Saugetiere Europas. Aula Verlag GmbH, Wiesbaden. Band 5/II (Carnivora), pp. 770-816.

YALCIN SAVAS & CEM ORKUN KIRAÇ 2002. Endgame: The fight for marine protected areas in Turkey. The Monachus Guardian, 5(1) 2002. (On line, accessed February 17 at http://www.monachus-guardian.org).

YOUNGMAN Ph. 1982. Distribution and systematics of the Europaean Mink Mustela lutreola Linnaeus, 1961 - Acta Zoologica Fennica, 166:1-48.

ZALEWSKI A., W. JEDRZEJEWSKI & B. JEDRZEJEWSKA. 1995. Pine marten home range, numbers and predation on vertebtates in a deciduous forest (Bialowieza National Park, Poland) - Ann. Zool. Fennici, 32: 131-144.

ZLATANOVA D., P. TZVETKOV, E. TZINGARSKA-SEDEFCHEVA 2001. The lynx in Bulgaria: present conservation status and future prospects. In: Breitenmoser-Wursten C. and Breitenmoser U. (Eds.) The Balkan lynx population – History, Recent Knowledge on its Status and Concervation Needs. Kora Bericht. Muri, 7: 19-25.

Aves

Alleon A. 1886. Memoire sur les oiseaux dans la Dobroudzha et la Bulgarie. - Ornis, Wien, 2: 397-428.

Arabadjiev I. 1964. Black-winged Stilt. - Priroda i znanie, 6. (In Bulgarian).

Balát F. 1962. Contribution to the knowledge of the Avifauna of Bulgaria. - Brnĕnskĕ základny československé akademie vĕd, 434(34): 445-496.

Baumgart W. 1970. Über die Vögel im Küstengebiet der südlichen Dobrudsha (Silberküste).– Falke,17: 220-231.

Baumgart W. 1971. Beitrag zur Kenntnis der Greifvögel Bulgariens. – Beitr. Vögelkd., Leipzig, 17, 1: 33-70. (In German).

Baumgart W. 1971. Zum Vorkommen von Mittelmeer- und Nonnensteinschmätzern in der VR Bulgarien. - Beitr. Vogelkd. 17(6): 449-456.

Baumgart W. 1991. Über die Geier Bulgariens. A. Der Schmutzgeier (Neophron percnopterus). – Beitr. Vogelkd., 37(1/2), 1-48.

Baumgart W. 1967. Alpendohle kolonien in felsschachten des Westbalkan. - J. Orn., 108, 17, 1: 37.

Bernard-Laurent A., Z. Boev 1997. Alectoris graeca, Rock Partridge. - In: Hagemeijer W. J.M., M.J. Blair (eds.). The EBCC Atlas of European Breeding Birds. Their Distribution and Abundance. T & A D Poyser, London, 207 р.

Bijlsma R. G. 1997. Honey Buzzard, Pernis apivorus. - In: Hagemeijer W.J.M., M.J. Blair (eds). The EBCC Atlas of European Breeding birds: Their Distribution and Abundance. T & A D Poyser, London: 130-131.

BirdLife International 2004. Birds in Europe: population estimates, trends and conservation status. Cambridge, UK: BirdLife International. (BirdLife Conservation Series № 12), 374 p.

BirdLife International 2005. Ficedula semitorquata. - In: IUCN 2006. 2006 IUCN Red List of Threatened Species.

BirdLife International/EBCC. 2000. European bird populations: estimates and trends. Cambridge, UK, BirdLife International Conservation Series No10.

Blume D. 1973. Schwarzspecht, Grünspecht, Grauspecht. VEB Wiss., Leipzig: 120 pp.

Boetticher H. 1927. Kurze Uebersicht uber die Raubvogel und Eulen Bulgariens. – Verh. Orn. Ges. Bayern, 17: 535-549.

Boetticher H. 1927. Kurzer Uebrblick uber die Wasser – und Sumpfvogel Bulgariens. – Verh.orn. Ges. Beyern, 17(3): 180-198.

Boetticher H.V. 1919. Ornithologische Beobachtungen in der Muss-Alla Gruppe (Rila-Gebirge), 1916-1919. – J. Orn., 67: 233-357.

Boev N. 1985. Shag, Phalacrocorax aristotelis. - In: Botev B., Ts. Peshev (Eds.). Red Data Book of Bulgaria 1985. Vol. 2, Animals, BAN, Sofia, 47-48.

Boev N. 1985. Woodcock, Scolopax rusticola L. In: Botev B., Ts. Peshev (Eds.). Red Data Book of Bulgaria. BAS, Sofia, 109-110.

Boev N., J. Georgiev and S. Donchev 1964. Birds of Thrace. - In: Fauna of Thrace. BAS, Sofia, 1: 55-105 (In Bulgarian).

Boev N., S. Simeonov 1967. Über die Verbreitung einiger Eulen-Arten in Südost-Europa. - Acta zool. (Scopie), Mus. Maced. Scient. Natur., 11(1): 1-15.

Borisov B. 1988. Ornithological researches in the southwestern part of the Sakar Mountain. - Ornithological Information Buletin, BAS, 23-24: 24-28. (In Bulgarian).

Borisova N., V. Antonova, V. Delov and D. Dimitrov 2005: Using GIS and Remote Sensing in Biogeography Assessment in the Karst Terrain of the Chepun Mountain and Dragoman Marshland (W. Bulgaria). In: Biodiversity, Ecosystems, Global Changes. Petekston, Sofia, 75-82.

Botev B., Ts. Peshev (Eds.). 1985. Red Data Book of Bulgaria. Vol. 2, Animals, BAN, Sofia, 183 p.

Čapek M., B. Kloubec 1996. First breeding record of Finsch`s Wheatear (Oenanthe finschii) and some observations of four other Oenanthe species in Bulgaria. - Folia Zool. 45, 1: 95-96.

Clement P. 1997. Pied Wheatear Oenanthe pleschanka. - In: Hagemeijer, W.J.M., M.J. Blair (eds.). The EBCC Atlas of European Breeding Birds: Their Distribution and Abundance. T & A D Poyser, London: 533.

Cramp S. (Ed.) 1988. Handbook of the Birds of Europe the Middle East and North Africa. The birds of the Western Palearctic. Vol. V. Oxford, London, Oxford University Press, 1063 p.

Cramp S., C.M. Perrins (Еds). 1994. Handbook of the Birds of Europe the Middle East and North Africa. The Birds of the Western Palearctic. Vol. VIII. Oxford, Oxford University Press. 899 p.

Cramp S. (Ed.). 1983. Handbook of the Birds of Europe the Middle East and North Africa. The Birds of the Western Palearctic, Vol. IV, Oxford, Oxford University Press: 48-62.

Cramp S., C.M. Perrins (Еds). 1993. Handbook of the Birds of Europe the Middle East and North Africa. The birds of Western Palearctic. Vol. VII. Oxford, New York: Oxford University Press, 377 - 396.

Cramp S., C.M. Perrins (Eds). 1993. Handbook of the Birds of Europe the Middle East and North Africa. The birds of the Western Palearctic. Vol. VIII . Oxford: Oxford Univ. Press, 581 р.

Cramp S. (Eds). 1992. Handbook of the Birds of Europe the Middle East and North Africa. The birds of the Western Palearctic. Vol. VI. Oxford: Oxford Univ. Press. 728 p.

Cramp S., K.E.L. Simmons (Еds). 1980. Handbook of the Birds of Europe the Middle East and North Africa. The Birds of the Western Palearctic. Volume II, Oxford, Oxford University Press, 695 р.

Cramp S., K.E.L. Simmons (Еds). 1977. Handbook of the Birds of Europe the Middle East and North Africa. The Birds of the Western Palearctic. Vol. I., Oxford – London – New York, Oxf. Univ. Press. 913 pp.

Crockford N., R. Green, G. Rocamora, N. Schaffer, T. Stowe and G. Williams (compliers). 1995. Action Plan for the Corncrake, Crex crex. T-PVS-Bird, 22, Council of Europe, Strasburg, 63 p.

Dalakchieva S. 2003. Composition of the avifauna in agricultural lands in Western Bulgaria. Part II. Passeriformes. - Annuarie de l’Universite de Sofia, Book 1-Zoology, 93-94: 137-149.

Dalakchieva S. 2004. Breeding biology of waders order Charadriiformes (families Haematopodidae, Recurvirostridae, Burhinidae, Glareolidae, Charadriidae and Scolopacidae) along the Black Sea coast. PhD thesis, Institute of Zoology, BAS, 294 p. (In Bulgarian).

Darakchiev A., Y. Philipova 1986. Territorial distribution of some species of the plover birds along the middle reaches of the river Strouma. - Travaux scientifiques Universite de Plovdiv “Paissi Hilendarski”. vol. 24, fasc. 1: 201-206 (In Bulgarian).

Del Hoyo J., A. Elliot, J. Sargatal (Еds). 1992. Handbook of the Birds of the World, Vol. 1. Ostrich to Ducks. Lynx Edicions, Barcelona, 696 p.

Delestrade A., G. Stoyanov 1995. Breeding biology and survival of the Alpine Chough (Pyrrhocorax graculus). - Bird Study, 42: 222-231.

Delov V. 1995. Investigation of the Corncrake (Crex crex L.) in the Region of Sofia. - Annuarie de l’Universite de Sofia, Vol. 88, livre 4, 25-31.

Delov V. 1998. National Corncrake Survey in Bulgaria’ 96 (Final report). Sofia, BSPB/BirdLife Bulgaria, 28 p.

Delov V. 1999. The Corncrake (Crex crex) in Bulgaria. In: Schäffer, N., U. Mammen (eds). Proceedings of the International Corncrake Workshop 1998, Hipolstein/Germany, 17-24 p.

Delov V. 2000. Comparative study of habitat preferences and distribution of rails and crakes (Rallidae) in Bulgaria. - Advances in Ethology (supplements to Ethology), Backwell Verlag, Berlin-Vienna, 35: 123 p.

Delov V. 2000. Habituation of some wild caught rails and crakes (Rallidae). - Advances in Ethology (supplements to Ethology), Backwell Verlag, Berlin-Vienna, 35: 132.

Delov V. 2002. Diurnal and seasonal pattern of feeding activity of some wild caught European rails and crakes (Rallidae). - Advances in Ethology (supplements to Ethology), Backwell Verlag, Berlin-Vienna, 35: 32.

Delov V. 2002. Motor activity and some other behavioral aspects of European rails and crakes (Rallidae) in captivity. - Advances in Ethology (supplements to Ethology), Backwell Verlag, Berlin-Vienna, 37: 33.

Delov V. 2004. Distracting behaviour of male Corncrakes (Crex crex) against olfactory predators during incubation-a case of indirect parental care? - Advances in Ethology (supplements to Ethology), Backwell Verlag, Berlin-Vienna, 38: 54.

Delov V., P. Jankov and N. Petkov 1995. Pilot National Survey on the Corncrake (Crex crex) in Bulgaria (Final report), Sofia, BSPB/BirdLife Bulgaria, 16 p.

Delov V., P. Jankov. 1997. National survey of the Corncrake, Crex crex in Bulgaria in 1995. - Die Vogelwelt, 118: 239-241.

Dementiev G., N. Gladkov (Еds) 1952. Birds of USSR. Vol. 4. Moscow, Soviet science. 640 p. (In Russian).

Dementyev G.P., N.A. Gladkov, E.S. Ptushenko, E.P. Spangenberg and A.M. Sudilovskaya 1951. Birds of the USSSA. Volume I. M: Science. 652 pp. (In Russian).

Dereliev S. 1998. Monitoring of Red-breasted Geese in Bulgaria in the 1990s. - Threatened Waterfowl Specialist Group News,11: 38-40.

Dereliev S., D. Hulea, B. Ivanov, W.J. Sutherland and R.W. Summers 2000. The numbers and distribution of Red-breasted Geese Branta ruficollis at winter roosts in Romania and Bulgaria. - Acta Ornithologica, 35: 37-40.

Dereliev S. 2007. Mute Swan Cygnus olor. - In: Iankov, P. (ed.) Atlas of breeding birds in Bulgaria. BSPB Conservation Series. Book 10. BSPB, Sofia. (In English and Bulgarian)

Dereliev S. 2000a. Dynamics of numbers and distribution of the Red-breasted Goose Branta ruficollis (Pallas, 1769) in its main wintering range in the region of lakes Shabla and Durankulak. MSc thesis. Faculty of Biology, Sofia University “St. Kliment Ohridski”. Sofia. 91 p. (In Bulgarian).

Dereliev S. 2000b. Results from the monitoring of wintering geese in the region of lakes Shabla and Durankulak for the period 1995-2000. Bulgarian-Swiss Biodiversity Conservation Programme & Bulgarian Society for the Protection of Birds/BirdLife Bulgaria. Report. Sofia. 79 p. (In Bulgarian).

Dereliev S., I. Ivanov, D. Georgiev, N. Petkov and L. Griffin 2005. Results from the monitoring of wintering Red-breasted Geese Branta ruficollis in the region of the lakes Shabla and Durankulak (NE Bulgaria) in 2003-2005. BSPB Technical Series Report No: 1-2005. Sofia, Bulgaria. 8 p.

Dereliev S. (in press). The Red-breasted Goose in the new millennium – a thriving species or a species on the brink of extinction? In: Proceedings of the Waterbirds around the World Conference.

Dimitrov M., L. Profirov, K. Nyagolov and T. Michev 2000. Record Counts of White-headed Duck in Bulgaria. - TWSG News, 12: 18-20.

Dimitrov M., L. Profirov, T. Michev and K. Nyagolov 2000. Long-termed Monitoring of White-headed Duck (Oxyura leucocephala) in the Complex of Bourgas Lakes and Conservation Measures. In: Proceedings of White-headed Duck Int. Workshop, Porto Lagos, Greece, 2000. Hellenic Orn. Soc./BirdLife International.

Dimitrov M., T. Michev, L. Profirov and K. Nyagolov 2005. Waterbirds of Bourgas Wetlands. Results and Evaluation of the Monthly Waterbird monitoring 1996-2002. Bulgarian Biodiversity Foundation and Pensoft Publishers, Sofia-Moscow, 160 p.

Donćev S. 1963. Über die brutökologie des säbelschnäblers (Recurvirostra avosetta L.) in Bulgarien. - Fragmenta Balcanica Mus. Maced. Sci. Nat. 4, 23 (107): 177-178.

Doncev S. 1964. Über die Verbreitung einiger neuer und seltener Vögel in Bulgarien.- Bull. de L`institute de Zoologie et Musee, 16: 23-28.

Doncev S. 1965. Neue Funde von Sylvia melanocephala (Gmelin), S. cantilans (Pallas) in Bulgarien. - Bull. De L`institute de Zoologie et Musee, 18: 59-64.

Doncev S. 1981. New habitats of some species of southern origin in Bulgaria. - Aquila, 87: 27-29.

Dontchev S. 1973. Migration, wintering and nesting sites of the Mute Swan, Cygnus olor (Gmelin) in Bulgaria. In: Proc. IWRB Symp. Rational Vsc. Waterfowl. Brno, 1972. 72-74.

Dontchev S., V. V. Serebryakov. 1997. Paddyfield Warbler, Acrocephalus agricola. - In: Hagemeijer, W. J. M., M. J. Blair (Еds). The EBCC Atlas of European Breeding Birds: Their Distribution and Abundance. T & A D Poyser, London: 569 p.

Dumanov N. 1936. Something about the Woodcock. - Lovets, 37: 6-7.

Dunn E.K. 1972. Effect of age on the fishing ability of Sandwich Tern, Sterna sandvicensis. - Ibis. 114: 360-366.

Dyrcz A., M. Janiga 1997. Alpine Accentor. – In: Hagemeijer, E.J.M., M.J. Blair (Eds.). 1997. The EBCC Atlas of European Birds: Their Distribution and Abundance. T. & A. D. Poyser, London: 510 p.

Elwes H., T. Buckley 1870. A list of the Birds of Turkey. - Ibis, 2(6): 327-341.

Finsch O. 1859. Beitrage zur ornithologischen Fauna von Bulgarien mit besonderer Berucksichtigung des Balkans. - J. Orn., 7: 378-387.

Fitter R., F. Roux (Eds). 1971. Guide des oiseaux. Sélection du Reader’s Digest, Paris-Zurich, 494 p.

Flousek J., K. Hudec and U.N. Glutz Von Blotzheim 1993. Immissionsbedingte Waldschäden und ihr Einfluss auf die Vogelwelt Mitteleuropas. In: Glutz Von Blotzheim, U.N. and K.M. Bauer (Еds) Handbuch der Vögel Mitteleuropas, Vol. 13/1. AULA – Verlag, Wiesbaden: 11-30.

Georgiev D., D. Mitev and M. Thirsten 2003. Mass influx of Yelkouan Shearwaters along the Bulgarian Black Sea coast for first time after 70th years of ХХ Century. - Za Ptitsite, BSPB, 1: 15. (In Bulgarian)

Georgiev J. 1976. The Birds of the Black Sea Coast between Bourgas and Varna. - In: Terrestrial Fauna of Bulgaria, Materials. Sofia, BAS: 261-286 (In Bulgarian).

Georgiev V., B. Milchev 2000. Birds of the Vratza Mountains. II. Breeding bird atlas. – Annuarie de l’Universite de Sofia,91: 83-109.

Géroudet P. 1979. Les rapaces diurnes et nocturne d’Europe. Delachaux et Niestlé, Neuchâtel, Suisse: 426 p.

Gosler A.G., S. Mogyorósi 1997. Bearded Tit, Panurus biarmicus. In: Hagemeijer, W.J. M., M.J. Blair (Eds). The EBCC Atlas of European Breeding Birds: Their Distribution and Abundance. T & A D Poyser, London: 628-629.

Gradev G. 2003. Species composition of the ornithofauna of Lake Pomoriysko, conservation status and reconstruction of the habitats. Diploma work, Agricultural University - Plovdiv, 61 p. (In Bulgarian).

Green A. J. (Compiler). 1996. International action plan for the Marbled Teal, Marmaronetta angustirostris. - In: Heredia B., Rose L., M. Painter (Еds). Globally threatened birds in Europe. Action plans. Council of Europe Publishing, Strasbourg. Pp. 99-117.

Gröβler K. 1967. Faunistische Notizen von der Schwarzmeerküste Bulgariens. – Larus, Zagreb, 19: 212-235.

Hagemeijer E., M. Blair (eds). 1997. The EBCC Atlas of European Breeding Birds: Their Distribution and Abundance.T & A D Poyser, London. 903 p.

Handrinos G., T. Akriotis 1997. The Birds of Greece. Christopher Helm, A & C Black, London, 336 p.

Harris T., K. Franklin 2000. Shrikes and Bush-shrikes: Including wood-shrikes, helmet-shrikes, flycatcher-shrikes, philentomas, batises and wattle-eyes. Christopher Helm, A & C Black. London.

Harrison C.J.O. 1982. An Atlas of the Birds of the Western Palearctic. Princeton Univ. Press, Princeton, New Jersey, 332 p.

Harrison J. 1933. Contribution to the Ornithology of Bulgaria. With supplementary Notes by P. Pateff. - Ibis, 13(3): 494-521, 589-611.

Harrison J. 1933. Ornithology of Bulgaria. - Ibis, 13: 494-521.

Howard R., A. Moore (1980). A complete check list of the bird of the world. Oxford-New York, Oxf. Univ. Press. 771 p.

HTTP://bspb.org/srednozimno.php

Hubálek Z. 1978. Ornithologische Notizen aus Südost-Bulgarien. - Falke, 25(2): 42-48.

Iankov P. (ed.). 2007. Atlas of the Breeding Birds in Bulgaria. Bulgarian Society for the Protection of Birds, Conservation Series, Book 10. Sofia, BSPB, 679 p. (In Bulgarian and English).

Iankov P. 1981. A new breeding site of the Griffon Vulture (Gyps fulvus Hablizl) in Bulgaria. – Bull. Acad. Sci. Belorussian SSR, Minsk, 5: 117-118. (In Russian with English Summary).

Iankov P. 1984. New species for the Bulgarian Bird Fauna. Eleonora’s Falcon. – Zashtita na prirodata, 8: 28-29. (In Bulgarian).

Iankov P. 1986. Some observations of birds of the orders Anseriformes and Charadriiformes in Eastern Rhodopi Mountain. - Ornithological Information Buletin, 19-20: 111-121. (In Bulgarian).

Iankov P. 1991. The birds of the Eastern Rhodopes. I. Time of presence and dynamics of the ornithofauna. - Еcology (BAS), 24: 26-42. (In Bulgarian with English Summary).

Iankov P. 1992. Eleonora’s Falcon (Falco eleonorae Gene, 1839) - a new species for Bulgaria. – Bull. Nat. Hist. Mus. Belgrade, 47: 281-284.

Iankov P. 1996. Where to watch birds in Bulgaria. S., Pensoft. 179 p.

Iankov P. 1997. Rock Nuthatch (Sitta neumayer). In: In: Hagemeijer E.J.M. and M.J. Blair (Editors). The EBCC Atlas of European Birds: Their Distribution and Abundance. T & A D Poyser, London: 647.

Iankov P., L. Andreev, G. Gerasimov, A. Ignatov 1994. Spring migration of the soaring birds over the Sofia plain in 1986. - Ecology (BAS), 25: 14-24. (In Bulgarian with English Summary).

Iankov P., L. Profirov 1991. Contemporary state of the Griffon Vulture (Gyps fulvus Hablizl) population in Bulgaria. - Ecology (BAS), 24: 44-52. (In Bulgarian with English Summary).

Ivanchev V.P. 2000. On the ecology of the Stock Dove (Columba oenas): evaluation of the status in the Oka Reserve. - In: Proceedings of the Oka Biosphere Reserve, 20. Ryazan: 71-88. (In Russian).

Ivanov B. (in press). Recent population development of White-tailed Eagle in Bulgaria.

Ivanov B. 1998. The birds of the Shabla and Tuzlata lakes. In: Golemansky V. G., W. T. Naidenov (eds). 1998. Biodiversity of Shabla lake system. Acad. Publ. House “Prof. Marin Drinov”, Sofia: 129-141.

Ivanov B. 1998. The breeding birds of the Shabla lake. – Acta Zoologica Bulgarica, 50, 1: 35-42.

Ivanov B., P. Jankov 2001. Status and Numbers of White-headed Duck (Oxyura leucocephala) in Bulgaria. - Acta Zoologica Bulgarica, 53: 67-72.

Ivanov B., N. Karaivanov, S. Nonev 1998. Breeding bird communities in the steppe habitats of Dobrudzha, Bulgaria. – Acta Zoologica Bulgarica, 50 (2/3): 67-77.

Ivanov B., V. Pomakov 1983. Wintering of the Red-breasted Goose (Branta ruficollis) in Bulgaria. – Aquila,90: 29-34.

IWRB Database of the International Waterfowl Census (IWC). Accessed 1996. Slimbridge, UK: International Waterfowl and Wetlands Research Bureau.

Jankov P. 1986. Some observations of birds of the orders Anseriformes and Charadriiformes in Eastern Rhodopes. - Ornithologica Information Buletin, 19-20: 111-121.

Järvinen A. 1981. Population trends in the Redstart, Phoenicurus phoenicurus in northern Fennoscandia. - Ornis Fennica, 58: 129-131.

Jaschhof M. 1990. Ausgewählte ornithologische Beobachtungen von der bulgarischen Schwarzmeerküste. - Beitr. Vogelkd., 36(5): 283-290.

Jordans A. 1940. Ein Beitrag zur Kenntnis der Vogelwelt Bulgariens. - Mitt. Aus d. Kgl. naturw. Inst. Sofia, 13: 49-152.

Kambourova N. 2005. Eleonora`s Falcon Falco eleonorae(short notes). - Acrocephalus, 26 (124): 59.

Kambourova N. 2005. The recent status of breeding bird communities of Srebarna Biosphere Reserve (NE Bulgaria). - Acrocephalus, 26 (125): 81-97.

Königstedt D., D. Robel 1977. Ornithologische Reiseeindrücke aus Süd- und Ostbulgarien. - Falke, 24: 124-131, 168-171.

Kostadinova I. (ed.) 1997. Important Bird areas in Bulgaria. BSPB Conservation Series. Book 1. BSPB, Sofia. 176 pp. (In Bulgarian, English summary).

Kostadinova I., M. Gramatikov (Еds.) 2007. Important Bird Areas in Bulgaria. Second revised edition. Bulgarian Society for the Protection of Birds, Conservation Series Book 11, Sofia, BSPB, 639 pp. (In Bulgarian with English Summary).

Kostadinova I., S. Dereliev 2001. Results from the Mid-winter Counts of Waterbirds in Bulgaria for the period 1997-2001. BSPB Conservation Series Book 3. BSPB, Sofia, 96 p. (In English and Bulgarian).

Kotsakov G., D. Kantardjiev 1986. A mixed colony of Common Tern (Sterna hirundo L.), Collared Pratincole (Glareola pratincola L.) and Little Ringed Plover (Charadrius dubius Scop.) by the river Struma. - Ornithologica Information Buletin, 19-20: 52-53. (In Bulgarian).

Kouzmanov G., R. Todorov, G. Stoyanov. 1995. Information sur la repartition et la situation des rapaces nocturnes en Bulgarie. - Newsletter of the WWGBP, 21/22: 14-17.

Kurtev M. 2003. Urgent Conservation Measures for the Egyptian Vulture (Neophron percnopterus) in Bulgaria (phase I). Action Plan for the Recovery and Conservation of Vultures on the Balkan Peninsula and Adjacent Regions. Technical report to BVCF/FZS, 29 р.

Kurtev M. 2004. Urgent Conservation Measures for the Egyptian Vulture (Neophron percnopterus) in Bulgaria (phase II). Action Plan for the Recovery and Conservation of Vultures on the Balkan Peninsula and Adjacent Regions. Technical report to BVCF/FZS, 34 р.

Kurtev M. 2005. Urgent Conservation Measures for the Egyptian Vulture (Neophron percnopterus) in Bulgaria (phase III). Action Plan for the Recovery and Conservation of Vultures on the Balkan Peninsula and Adjacent Regions. Technical report to BEPF/BVCF/FZS, 28 р.

Kuzev K. 1928. Our game birds. Sofia. Gutenberg Publ., 80 p.

Leisler B., E Heidrich, K. Schulze-hagen and M. Wink K. 1997. Taxonomy and phylogeny of reed warblers (genus Acrocephalus) based on mtDNA sequences and morphology. - J. Orn., 138: 469-496.

Madsen J., G. Cracknell and A.D. Fox (Еds) 1999. Goose populations of the Western Palearctic. A review of status and distribution. Wetlands International Publ. No. 48, Wetlands International, Wageningen, The Netherlands. National Environmental Research Institute, Ronde, Denmark. 344 p.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 2, Neumann Verlag, Leipzig: 312-314.

Makatsch W. 1976. Strix uralensis Pallas. – In: Die Eier der Vögel Europas, B. 2. Neumann Verlag, Leipzig, Radebeul: 50-52.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 1. Neumann Verlag, Leipzig, Radebeul: 174-176.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 2. Neumann Verlag, Leipzig, Radebeul: 17-18.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 2. Neumann Verlag, Leipzig, Radebeul: 89-91.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 2. Neumann Verlag, Leipzig, Radebeul: 80-82.

Makatsch W. 1976. Die Eier der Vögel Europas, Band 2. Neumann Verlag, Leipzig, Radebeul: 91-93.

Makatsch W. 1976. Die Eier der Vögel Europas, B. 2. Neumann Verlag, Leipzig, Radebeul: 85-87.

Makatsch W. 1976. Die Eier der Vögel Europas, B. 2. Neumann Verlag, Leipzig, Radebeul: 107-108.

Malling Olsen, K., H. Larsson 2003. Gulls of Europe, Asia and North America. Christopher Helm, London, 608 p.

Matvejev S., V. Vasić 1973. Catalogus faunae Jugoslaviae. IV/3. Aves. Ljubljana, A. S. Slovenica, 118 p.

Mauersberger G. 1960. Faunistische Notizen aus Nordost – Bulgarien (19 Mai bis 2 Juni 1959). - Journ. Orn., 101: 113–125.

Mauersberger G., J. Stubs 1963. Drei fur Bulgarien neue vogelarten. – Journ. Orn., 104: 440-441.

Mautsch H., H. Rank 1973. Rosenstare in der Süddobrudscha. - Falke, 20, 8: 268-272.

Menzel J., B. Miltschev 2001. Über eine sehr späte Brut des Triels (Burhinus oedicnemus) in Bulgarien. - Orn. Mitteil, 53: 384-385.

Meyburg B., Gallardo M., Meyburg K. and E. Dimitrova 2004. Migrations and sojourn in Africa of Egyptian Vultures (Neophron percnopterus) tracked by satellite. Dt. Ornithologen-Gesellshaft e.V., 145: 273-280.

Michev T. 1982. Status and conservation of the diurnal birds of pray in Bulgaria. In: National theoretic conference on the conservation and reproduction of environment. Slunchev Bryag, 1-5. ХІ. 1982. BAS. 326-330. (In Bulgarian).

Michev T. 1985. Black-winged Stilt (Himantopus himantopus). - In: Botev B., Ts. Peshev (Eds.). Red Data Book of the Bulgaria. BAS, Sofia. 112. (In Bulgarian).

Michev T. 1985. Collared Pratincole (Glareola pratincola). - In: Botev B., Ts. Peshev (Eds.). Red Data Book of the Bulgaria. BAS, Sofia. 114-115. (In Bulgarian).

Michev T. M., V.A. Pomakov, D. Nankinov, B.E. Ivanov and L. Profirov 1991. A short note on wild geese in Bulgaria during the period 1977 to 1989. - In: Fox A.D., Madsen J., van Rhijn J. (Еds.) 1991. Western Palearctic Geese. Proc. IWRB Symp. Kleve 1989 in Ardea, 79(2): 167-168.

Michev T., D. Nankinov, B. Ivanov and V. Pomakov 1983. Midwinter numbers of wild geese in Bulgaria. – Aquila,90: 45-54.

Michev T., L. Profirov 1997. Evolution des effectifs hivernaux de la Bernache à cou roux en Bulgarie. – Branta,2: 10-13. (In French and Bulgarian).

Michev T., L. Profirov, M. Dimitrov and K. Nyagolov 2004. The Birds of Atanasovsko Lake: Status and Check List. 2nd edit. Bourgas Wetlands Publication Series, 5, Bulgarian Biodiversity Foundation, Project ‘Bourgas Wetlands’, Bourgas. 44 p.

Michev T., L. Profirov 2003. Mid-winter numbers of waterbirds in Bulgaria (1997-2001). Results from 25 years of mid-winter counts carried out at the most important Bulgarian wetlands. Pensoft. Sofia- Moscow, 160 p.

Michev T., S. Simeonov 1985. Changes in birds fauna of Bulgaria over the last thirty five years (1950-1984). – In: International symposium “Protection of natural areas and the genetic fund they contain” - Project 8 on the programme MAB. Blagoevgrad, 23-28. IX. 1985. Sofia, BAS, 200-217.

Michev T., Ts. Petrov and L. Profirov 1985. Status, Breeding, Distribution, Numbers and Conservation of the White Stork in Bulgaria. - In: White stork status and Conservation, Walsrode, 14-19, 10, 1985, 137-143.

Michev T., V. Pomakov, V. Stefanov and P. Iankov 1980. A Breeding Colony of the Griffon Vulture (Gyps fulvus Hablizl) in the Eastern Rhodopes. – Ecology (BAS), 6: 74-79. (In Bulgarian with English Summary).

Mikkola H. 1983. Owls of Europe. T & A. D. Poyser, UK, 397 p.

Milchev B. 1994. Breeding bird atlas of the Stranja Mountains, South-East Bulgaria. - Sandgrouse, 16: 2-27.

Milchev B. 1998. The Birds in the Bulgarian Part of the Strandja Mountains. I. Species List and Status. - Annuarie de l’Universite de Sofia, Faculty of Biology, Book. 1-Zoology, 88-90: 25-43.

Milchev B., A. Kowatschew 2000. Habitat distribution and breeding biology of the Orphean Warbler (Sylvia hortensis) in the South-eastern Bulgaria. -Sandgrouse: 22 (2): 87-92.

Milchev B., D. Dimitrov 2005. Structure, Dimensions and Building Materials of the Nests of the Rose-coloured Starling, Sturnus roseus (Linnaeus, 1758) (Aves: Passeriformes) from South-East Bulgaria. - Acta Zoologica Bulgarica, 57(1): 55-64.

Miltschew B., D. Tschobanov 2002. Brutverluste und Nahrung des Rosenstars Sturnus roseus in Südost-Bulgarien im Jahr 2000. - Vogelwelt, 123: 99-103.

Möckel, R. 1988. Die Hohltaube. Neue Brehm-Bucherei 590, Ziemsen, Wittenberg.

Mountfort G., I. Ferguson-Lees 1961. Observations on the birds of Bulgaria. – Ibis, 103a: 443-471.

Muller A. 1927. Bericht uber eine Sammelreise in der Dobrudscha und auf Schlangeninsel. - Verh. u. Mitt. Siebenburg. Ver. Naturwiss, Hermannstadt, 77(2): 11-40.

Мunteanu D., S. Svensson 1997. Eremophila alpestris. - In: E J M Hagemeijer and M J Blair (Editors). The EBCC Atlas of European Birds: Their Distribution and Abundance. T & A D Poyser, London: 472-473.

Nadler T., U. Ihle 1988. Beobachtungen am Feldrohsanger Acrocephalus agricola in Bulgarien. - Limicola, 2(6): 205-217.

Nankinov D. 1982. Birds of Sofia. - Ornithologica Information Buletin, 12: 386 p. (In Bulgarian).

Nankinov D. 1985. Bearded Tit, Panurus biarmicus (L., 1758). - In: Botev B., Tz. Peshev (eds.) Red Data Book of the Bulgaria. V. 2, BAS, Sofia. 129. (In Bulgarian).

Nankinov D. 1985. Green Sandpiper (Tringa ochropus L.). - In: Botev B., Tz. Peshev (eds.) Red Data Book of Bulgaria, V. 2, BAS, Sofia. 108-109.

Nankinov D. 1985. Lesser Spotted Eagle (Aquila pomarina). - In: Botev B., Tz. Peshev (eds.) Red Data Book of Bulgaria. V.2, BAS, Sofia. 78-79.

Nankinov D. 1985. Mute Swan (Gygnus olor) Gm. – In: Botev B., Tz. Peshev (eds.) Red Data Book of the PR of Bulgaria. V. 2. Animals. BAS, Sofia. 59.

Nankinov D. 1985. Shelduck (Tadorna tadorna). In: Botev B., Tz. Peshev (eds.) Red Data Book of Bulgaria. V.2, BAS, Sofia. 61-62.

Nankinov D. 1993. Status and conservation of breeding seabirds in Bulgaria. - In: Aguilar et al. Estatus y Conservation de Aves Marina. Actas del II Simposio Medmaravis. SEO. Madrid: 275-283.

Nankinov D. 1994. Eleonora’s Falcon in Bulgaria. - Newsletter of the World Working Group on Birds of Prey & Owls (WWGBP), 19: 11-12.

Nankinov D. 1997. Status of Tengmalm’s Owl, Aegolius funereus, in Bulgaria. - Riv. ital. Orn., 66(2): 127-136.

Nankinov D. 2000. Range expansion and current breeding distribution of River Warbler Locustella fluviatilis in Bulgaria. - Sandgrouse, 22(1): 50-54.

Nankinov D. 2001. State of Black Sea population of Shag (Phalacrocorax aristotelis). - J. Balkan Ecology, 4(4): 367-374.

Nankinov D., S. Dalakchieva 2001. State of the Stone Curlew Burhinus oedicnemus in Bulgaria. - The Russ. J. Orn., Express-issue, 152: 603-613.

Nankinov D., G. Stoyanov, G. Kouzmanov and R. Todorov 1991. Informations sur la situation des Rapaces diurnées en Bulgarie. - Birds of Prey Bulletin, 4: 293-302.

Nankinov D., K. Cvetkova, K. Bedev, G. Lamburov, N. Minchev, V. Bozhilov, S. Marin, G. Seizov and G. Kotsakov 1996. An attempt of a census of the waders in Bulgaria, March-May 1990. In: Proceedings of the XXII Congress Int. Union of Game Biologists, Sofia, 38-51.

Nankinov D., P. Shurulinkov, I. Nikolov, B. Nikolov, S. Dalaktchieva, I. Hristov, R. Stanchev, A. Rogev, A. Dutsov and M. Sarov 1998. Studies of the waders (Charadriiformes) on the wetlands around Sofia (Bulgaria). - Riv. Ital. Orn., 68 (1): 63-83.

Nankinov D., S. Dalakchieva 2002. Breeding distribution of Woodcock (Scolopax rusticola) in Bulgaria. - Forestry Ideas, 3-4 (27): 97-103.

Nankinov D., S. Dalakchieva, K. Popov and S. Kirilov 2002. Die Geschichte der Rostflugel-Brachschwalbe Glareola pratincola in Bulgarien. - Orn. Mitt., 54 (7/8): 234-242.

Nankinov D., S. Dalakchieva, K. Popov, S. Kirilov, P. Iankov, R. Stanchev and P. Schurulinkov 2001. Die Invasion des Rosenstares in Bulgarien im Jahre 2000. - Orn. Mitt. 53, (6/7): 240-244.

Nankinov D., S. Kirilov. 2005. Winternachweis eines Eleonorenfalken an der bulgarischen Schwarzmeerküste. - Orn. Mitt., 57(11): 374-376.

Nankinov D., S. Simeonov, T. Michev and B. Ivanov 1997. The Fauna of Bulgaria. Vol. 26. Aves. Part II. Publ. Houses “Marin Drinov” & Pensoft: 427 p. (In Bulgarian with English summary).

Nankinov D. 2001. About the first and following observations of the Masked Shrike (Lanius nubicus Lichtenstein) in Bulgaria. - In: Geoecological and bioecological problems of the North Black Sea Coast. Proc. Int. Conf. Tiraspol, March 28 - 30, 2001. Tiraspol: EPD DSU – ECODNIESTER: 177-181. (In Russian)

Nankinov D. 2002. Paddyfield Warbler, Acrocephalus agricola in Bulgaria. – Journal of Balkan Ecology, 5(1): 14-19.

Nankinov D. 2002. Present situation of population of owls in Bulgaria. - Berkut, 11(1): 48-60. (In Russian).

Nankinov D. A. Dutsov, B. Nikolov, B. Borisov, G. Stoyanov, G. Gradev, D. Georgiev, D. Popov, D. Domuschiev, D. Kirov, E. Tilova, I. Nikolov, I. Ivanov, K. Dichev, K. Popov, N. Karaivanov, N. Todorov, P. Shurulinkov, R. Stanchev, R. Aleksov, R. Tsonev, S. Dalakchieva, S. Ivanov, S. Marin, S. Staykov, S. Nikolov and H. Nikolov. Breeding totals of the ornithofauna in Bulgaria. Green Balkans. Plovdiv. 32 p.

National bird databank of bspb, Sofia. Bulgarian Society for the Protection of Birds/BirdLife Bulgaria, Sofia.

Newton I. 1972. Finches. London, Collins.

Niethammer G. 1934. Zur Vogelwelt Bulgariens, insbesondere sciner nordwestlichen Landesteile. - Ornithologische Monatsberichte, 1: 267-285.

Nikolov B. 2006. The Shrikes (family Laniidae) (Aves: Passeriformes) in Bulgaria – distribution, breeding biology and migrations. PhD thesis, Institute of Zoology – BAS, Sofia. (In Bulgarian).

Nikolov B., I. Hristov, P. Shurulinkov, I. Nikolov, A. Rogev, A. Dutsov and R. Stanchev. 2001. New data on some poorly-studied forest species of owls (Strix uralensis, Glaucidium passerinum, Aegolius funereus) in Bulgaria. - Forest Science, 38 (1/2): 75-86. (In Bulgarian).

Nikolov B.P. 2002. Melanistic Levant Sparrowhawk Accipiter brevipes in south-west Bulgaria. - Sandgrouse, 24(2): 140.

Nikolov S. 2003. New locality in unusual habitat of Tengmalm’s Owl (Aegolius funereus) in Bulgaria. - Buteo, 13: 89-93.

Nikolov S. 2004. Woodcock, Scolopax rusticola. - Acrocephalus, 25(122): 174-175.

Nikolov S. 2005. Breeding birds in Macedonian Pine Pinus peuce forests: species composition and status in the Pirin National Park, Bulgaria. - Ciconia, 14: 26-34.

Nikolov S., S. Spasov 2005. Frequency, density and numbers of some breeding birds in the Kresna Gorge. - Ornithologica Information Buletin, 23-24: 106-108. (In Bulgarian).

Nikolov S., V. Vassilev 2004. Breeding bird atlas of the Ponor Mountains, western Bulgaria. – Sandgrouse, 26 (1): 7-22.

Nilsson S. G. 1997. Black Woodpecker. - In: Hagemeijer, E. J. M., M. J. Blair (Editors). The EBCC Atlas of European Birds: Their Distribution and Abundance. T. & A. D. Poyser, London: 448-449.

Nonev S. 1978. On the number and breeding biology of the Shag (Phalacrocorax aristotelis) along the Dobrudja Black Sea Coast in 1975-1977. - Ornithological Information Buletin, 3: 11-13. (In Bulgarian).

Nyagolov K., L. Profirov, T. Michev, M. Dimitrov 2003. Observations on breeding Rosy Starlings in Bulgaria. - British Birds, 96(5): 242-246.           4(4): 367-374.

Ornithological data base – Green Balkans Federation.

Otto W. 1984. Nestfund des Feldrohrsängers, Acrocephalus agricola, in der Volksrepublik Bulgarien. - Beitr. Vogelkd. 30, 3: 210-211.

Pačenovsky S. 1996. Sovy na Starej planine v Bulharsku. - Buteo, 8: 109-112.

Pandourski I. 2001. Recherches Hidrobiologiques des Zones Humides de la Cote Bulgare de la Mer Noire. I. Le Lac de Vaja. - Riv. Idrobiol., 40(2-3): 322-334.

Paspaleva-Antonova M. 1961. Studies on the ornithofauna of the Bulgarian Danube banks. PhD thesis. Sofia. 145 p.

Paspaleva-Antonova M. 1967. Die Wasservogel in Bulgarien ihre Vorkommen und ihre Standorte. - In: Proc. Int. Conf. Wilde. Res. Cons. Brno, 17-30.

Paspaleva-Antonova М. 1965. Angaben über neue und seltene Bulgarische Vogelarten. - Bull. Inst. Zool. et Musee, ABS, 19: 33-38. (In Bulgarian with German Summary).

Pateff P. 1948. Some Ornithological Observations from Pomoriisko Lake on the Black Sea. - Larus, Zagreb, 2: 22-28.

Patev P. 1950. The Birds of Bulgaria. Sofia Publ. House of BAS, 364 p. (In Bulgarian, English summary).

Patzold R. 1989. Lerchenstudien an der bulgarischer Schwarzmeerkuste. - Der Falke, 36 (9): 298-303; 36 (10): 349; 36 (11): 386-389.

Petkov N. (in press). Breeding Numbers and Distribution of Some Wetland Birds in Bulgaria. Bird Numbers 2004 EBCC meeting proceedings, Kaiseri, Turkish Journal of Zoology.

Petrov A., 1950. Our game birds Sofia. - Fizkultura, 64 pp. (In Bulgarian).

Petrov B., S. Zlatanov 1955. Materials on the bird fauna in Dobroudzha. - Papers of Sc. Institute at the Ministry of agriculture, 1: 93-112. (In Bulgarian)

Petrov T. 1981. Birds of Mt. Sredna Gora. - Bull. of the Museums of Southern Bulgaria., 8: 9-49. (In Bulgarian).

Petrov T. 1989. Birds of Dobrostan ridge and its surroundings (Western Rhodopes). - Bull. of the Museums o f Southern Bulgaria, 15: 59-72. (In Bulgarian).

Petrov Ts. I. Hristov and I. Angelov 2005. Population Status of the White Stork (Ciconia ciconia) in Bulgaria for the Period of 2004/2005. - In: Petrov Ts. (Ed.-in Chief). The White Stork (Ciconia ciconia) in Bulgaria. II. Conservation Series, Book 7, BSPB (In Bulgarian, English summary).

Petrov Ts., P. Iankov, D. Georgiev. 1997. Population status of the White Stork (Ciconia ciconia) in Bulgaria for the period of 1994/1995. – In: Ts. Petrov (Ed.-in Chief). The White Stork (Ciconia ciconia) in Bulgaria. Conservation Series, Book 2, BSPB, Plovdiv, 13 – 22 (In Bulgarian, English summary).

Petrov Tz. 1981. Les oiseaux de la Sredna-gora. - Bull. Mus. S. Bulgaria, 7: 9-49.

Petrov Tz., P. Iankov, R. Kolchakov, T. Michev, L. Profirov and K. Niagolov. 1995. Numbers, Distribution and Preservation of the Peregrine (Falco peregrinus) in Bulgaria. –Bull. of the Museums o f Southern Bulgaria, 21: 17-22.

Profirov L, T. Michev. 2002. Bulgaria. In: Marushevsky G. (ed.). Directory of Azov-Black Sea Coastal Wetlands. Wetlands International, Kiev, 16-45.

Profirov L. 1981. Study on the autumn migration of the soaring birds along the Black Sea coast near Bourgas. Diploma work, Faculty of Biology of Sofia University, 86 p. (In Bulgarian).

Profirov L., M. Dimitrov 2001. White-headed Ducks at Vaya, Bulgaria. - TWSG, 13: 9.

Prostov A. 1963. Beitrag zur Erforschung der Ornithfauna im Gebiet von Petric. - Bulletin de L`Institut de Zoologie et Musée, Académie Bulgare des Sciences 1: 33-78. (In Bulgarian with German summary).

Prostov A. 1964. Study on the ornithofauna of Bourgas area. - Bulletin de L`Institut de Zoologie et Musée, Académie Bulgare des Sciences, 15: 5-68. (In Bulgarian).

Prostov A., D. Smilova 1983. The ornithological collection of Bourgas museum.- Ornithological Information Buletin, 13-14:

Radakoff W. 1879. Ornithologische Bemerkungen uber Bessarabien, Moldau, Walachei, Bulgarian und Ost-Rumelien. Bul. Soc. Nat. Moskau, 13(53):150-178.

Reiser, O. 1894. Materialen zu einer Ornis balcanica. II. Bulgarien (einschließlich Ost-Rumeliens und der Dobrudscha). Verlag Carl Gerolds Sohn, Wien., 204 pp.

Robel D. 1973. Ornithologische Beobachtungen in Bulgarien im Juli 1971. - Larus, Zagreb, 25: 103-108.

Robel D., D. Königstedt 1978. Brutnachweis der Orpheusgrasmücke (Sylvia hortensis) in Südwestbulgarien. - Beitr. Vogelkd., 24: 104-106.

Robel D., D. Konigstedt. 1980. Bemerkungen ueber die Schwarzkopfmoewe (Larus melanocephalus) an der Bulgarischen Schwarzmeerkueste. – Larus, 31-32: 365-370.

Roberts J. 1979. Observation of the migration of raptors and other soaring birds in Bulgarria, 1975-1978. - Ibis, 121: 301-312.

Roberts J. 1980. Observation on the birds of the Bulgarian seabord, with new breeding records for SW Bulgaria of Masked Shrike (Lanius nubicus), Bonelli’s Warbler (Phylloscopus bonelli),and Blue Rock Trush (Monticola solitarius). - Bonn. Zool. Beitr., 1/2, 31: 20-37.

Roberts J. 1980. The Status of the Charadriiformes in Bulgaria. - Bonn. zool. Beitr., 31(1/2): 38-57.

Roberts J. 1981. A Contribution to the Study of the Avifauna of Lake Atanasovsko, Burgas. In: Reg. Symp. under Project 8 - MAB, UNESCO, Proceedings. Blagoevgrad, 20 - 24 Oct. 1980. Sofia, BAS, 549-565.

Roberts J. L. 2001. Invasion of the rosys. – Wildlife, 19(6): 62-63.

Ruge K., W. Weber 1974. Brutgebiet des Dreizehnspechts (Picoides tridactylus) im Eisenerzer Raum, Steiermark. - Anz. orn. Ges. Bayern, 13: 300-304.

Ryabitsev V. 2002. Birds of Ural, Priuralie and Western Siberia. Ural University Publ., Ekaterinburg, 650 p.

Saari L., P. Südbeck 1997. Grey-headed Woodpecker. In: Hagemeijer, E. J. M., M. J. Blair (Editors). The EBCC Atlas of European Birds: Their Distribution and Abundance. T. & A. D. Poyser, London: 442-443.

Scherzinger W. 1970. Zum Aktionssystem des Sperlingskauzes (Glaucidium passerinum, L.). - Zoologica 41: 1-130.

Scherzinger W. 1982. Die Spechte im Nationalpark Bayerischer Wald. Schriftenreihe des Bayerischen Staatsministeriums für Ernährung Landwirtschaft und Forsten 9. Passau: 1-119.

Schubert G., M. Schubert 1982. Ornithologische Beobachtungen aus Bulgarien. - Falke 29(11): 366-372.

Schulz H. (Ed). 1985. Weiβstorch - White Stork. In: Proceeding of the First International Stork Conservation Symposium, Walsrode, FRG, 14-17 October 1985. - Schriftenreihe Avifaunisten, 10: 137-143.

Scott D.A., P.M. Rose 1996. Atlas of Anatidae populations in Africa and Western Eurasia. Wetlands International, Publications No 14, Wetlands International, Wagenningen, the Netherlands, 336 p.

Shaw G. 1990. Timing and fidelity of breeding for Siskins Carduelis spinus in Scottish conifer plantations. - Bird Study, 37: 30 – 35.

Shurulinkov P. S., Ts. Zlatanov, K. Vultchev 2004. Eleonora`s Falcon Falco eleonorae and Griffon Vulture Gyps fulvus. - Acrocephalus, 25: 122: 174.

Shurulinkov P., B. Nikolov, R. Tsonev, I Nikolov, A. Roguev, M. Sarov, A. Dutsov, P. Podlesniy, R. Stanchev and I. Hristov. 2003. A contribution to the occurrence of some rare and poorly-studied species of birds during the nesting season in Maritime Dobroudzha. - Ann. Sofia Univ., Fac. Biol., Book 1 – Zoology, 93/94: 31-39.

Shurulinkov P., G. Stoyanov, P. Tzvetkov, K. Vultchev, R. Kolchagov and M. Ilieva 2003. Distribution and abundance of Tengmalm`s Owl, Aegolius funereus on Mount Pirin, south-west Bulgaria. - Sandgrouse 25(2): 103-117.

Shurulinkov P., G. Stoyanov 2005. New data on the distribution of Tengmalm’s Owl (Aegolius funereus) in Western Bulgaria. - Buteo 14: 61-66.

Shurulinkov P., G. Stoyanov 2005. Uber die sudlichste Grenze des Sperlingkauz-Vorkommens, Glaucidium passerinum. - Orn. Mitt., 57 (6): 198-200.

Shurulinkov P., G. Stoyanov. (in press). New findings of Pigmy Owl (Glaucidium passerinum) and Tengmalm`s Owl (Aegolius funereus) in Western and Southern Bulgaria. – Acrocephalus.

Shurulinkov P., I. Nikolov 2005. Recent status of the breeding avifauna in the canyons of Rousenski Lom river system, north-eastern Bulgaria. - Ciconia. 13: 77-87.

Shurulinkov P., R.Tsonev, B.Nikolov, G.Stoyanov and L. Asenov 2005. Birds of Central Danube plain. Green Balkans Federation. Sofia, 120 p. (In Bulgarian).

Simeonov S., T. Michev and D. Nankinov. 1990. The Fauna of Bulgaria. Aves. Volume 20. Part I. Sofia, BAS, 350 p. (In Bulgarian, English Summary).

Simeonov S. 1980. A new nesting site of the Tengmalm`s Owl (Aegolius funereus (L.)) in Bulgaria. - Ecology 6: 70-73. (In Bulgarian).

Simeonov S. 1985. The Sparrowhawk Accipiter nisus (L., 1758). - In: Botev B., Ts. Peshev (Eds.). 1985. Red Data Book of Bulgaria. Vol. 2, Animals, BAN, Sofia, 183 p.

Simeonov S. 1986. Birds of Mt. Pirin. In: Fauna of Southwestern Bulgaria. Part I: 61-81.

Simeonov S. 1988. Owls – our secretive friends. Sofia, BAS. 156 pp. (In Bulgarian).

Simeonov S., T. Michev, D. Nankinov. 1990. The Fauna of Bulgaria. Vol. 20. Aves. Part 1. Sofia, Publ. House of BAS. 350 p. (In Bulgarian, English summary).

Simeonov S., V. Baeva 1988. Birds of Mt. Ograjden. In: Fauna of Southwestern Bulgaria. Part II: 7-21.

Simeonow S., B. Iwanow. 1971. Uber Verbreitung und Nestbiologie der Beutelmeisse in Bulgarien. - Der Falke, 6: 184-189.

Snow D., C. Perrins. 1998. The birds of the Western Palearctic. Vol. 2, Passerines. Oxford, New York, Oxford Univ. Press. 1695 p.

Spiridonov G., I. Raev 2006. A strategy for conservation of virgin forests in Bulgaria: Conceptual paper. In: Virgin forests in Bulgaria. Sc. Edit. P. Veen, I. Raev. Royal Dutch Society for Nature protection, Ministry of Environment and Water-EEA: 111-123. (English and Bulgarian version).

Spiridonov G., L. Mileva and N. Spasov 1987. The nesting avifauna of Tsarichina Biosphere Reserve. - Biosphere Reserve Tsarichina, Ed. Polish Academy of Sciences and Bulgarian Academy of Sciences, Krakow: 104-121. (In Russian).

Spiridonov G., L. Mileva 1988. Threatened and rare species of birds in Steneto biosphere reserve. - Orn. Inf. Bull., 23/24: 99-105. (In Bulgarian).

Spiridonov J. 1988. Contribution to the breeding ornithofauna of Ludogorie. - Orn. Inf. bull., 23- 24: 89-98.

Spiridonov J., N. Spasov, L. Mileva 1982. New data on the distribution of Ural Owl (Strix uralensis) and Tengmalm’s Owl (Aegolius funereus) in Bulgaria. National Theoretical Conf. on environment protection, 1-5.09.1982, Sunny Beach, 1: 341-343.

Spiridonov J., R. Virkkala 1997. Dendrocopos leucotos. – In: Hagemeijer E.J.M. and M.J. Blair (Editors). The EBCC Atlas of European Birds: Their Distribution and Abundance. T & A D Poyser, London: 454-455.

Spiridonov Z., P. Simeonov 1988. Studies on the nesting ornithofauna of the “Tisata” reserve. - In: Fauna of the Southwestern Bulgaria, Part 2, BAS, Sofia, 23-29. (In Bulgarian).

Spiridonov Zh., N. Spasov, L. Mileva 1979. New locality of the Ural Owl (Strix uralensis Pallas). – Orn. Inf. Bull., 6: 22-25. (In Bulgarian).

Spiridonov Zh., N. Spasov 1981. Locality of the Tengmalm`s Owl (Aegolius funereus L.) in Stara planina Mountains. - Orn. Inf. Bull. 10: 30-32. (In Bulgarian).

Stoyanov G. 2004. Ein Beitrag zur Verbreitung des Felsenkleibers Sitta neumayer in Bulgarien. - Ornithologishe Mitteilungen. 56(5): 160-165.

Stoyanov G. 2005. Einige Brutdaten der Alpendohle Pyrrchocorax graculus im Osogovo- Gebirge Westbulgariens und Mazedoniens. - Ornithologishe Mitteilungen 57(10): 327-331.

Stoyanov G., D. Kjutcukov and D. Domuschiev 2004. The diurnal and nocturnal birds of prey (Falconiformes and Strigiformes) nesting in the territory of Sofia. Ecology of the City of Sofia. Species and Communities in an Urban Environment. Pensoft Publ. Sofia-Moscow, 437-450.

Stoyanov G., G. Kotskov, N. Todorov and V. Bojilov 2001. Species composition, occurrence and conservation status of the ornithofauna in Kresna Gorge (SW Bulgaria). In: Beron P. (ed.) Biodiversity of Kresna Gorge. Sofia, 305-323. (In Bulgarian).

Stoyanov G., P. Shurulinkov, D. Kjutchukov, P. Spakovski, V. Delov, K.Vultchev and A. Stoyanov 2003. Vom Brüten der Waldschnepfe Scolopax rusticola in Bulgarien. - Ornithologische Mitteilungen., 55 (6): 211-217.

Stoychev S., A. Petrova 2003. Protected Areas in Eastern Rhodopes and Sakar Mountains. Bulgarian Society for the Protection of Birds/BirdLife Bulgaria, Conservation Series, Book 7, Sofia, BSPB, 49 p. (In Bulgarian and English).

Stoychev S., H. Hristov, P. Iankov and D. Demerdzhiev 2004. Birds in the Bulgarian part of the Eastern Rhodopes.- In: Beron P., A. Popov (Eds). Biodiversity of Bulgaria. 2. Biodiversity of Eastern Rhodopes (Bulgaria and Greece), Pensoft & Nat.Mus.Natur.Hist., Sofia, 881-894.

Stoychev St., E. Stoynov, B. Barov 1997. Breeding ornithofauna of the Eastern Rhodopes – a maping survey (1996). In: Conservation of the biological diversity of the Eastern Rhodopes. Sofia, Bulgarian-Swiss Biodiversity Conservation Programme, V. 3, 21-38.

Stoychev St., Hr. Hristov, D. Demerdzhiev and I. Angelov 2004. Multiplying the Success: How to increase sustainability of the Populations of Large Vultures in the Eastern Rhodopes. Action Plan for the Recovery and Conservation of Vultures on the Balkan Peninsula and Adjacent Regions.Technical report to BEPF/BVCF/FZF, 34 р.

Thiollay J. M. 1994. Family Accipitridae (Hawks and Eagles). - In: del Hoyo, J., A. Elliot, J. Sargatal (Еds). Handbook of the Birds of the World. Vol. 2. New World Vultures to Guineafowl. Lynx Edicions, Barcelona. 52-205.

Todorov N. 1983. The birds in the region of "Dragichevo" ornithological station. - Orn. Inf. Bull., 13/14: 37-58. (In Bulgarian).

Todorov R., G. Stoyanov. 1996. Concepts and reality. Diurnal birds of prey and owls in Bulgaria. – Eco 1: 22-23. (In Bulgarian).

Uhlig R. 1988. Bestandzahlen aus Bulgarien. - Orn. Mitt., 40, 134-135.

Uttendörfer O. 1952. Neue Ergebnisse über die Ernährung der Greifvögel und Eulen. Verlag Eugen Ulmer, Stuttgart.

Vatev I., P. Simeonov, T. Michev and B. Ivanov 1980. The Masked Shrike (Lanius nubicus Lichtenstein) – a breeding species in Bulgaria. – Acta zoologica Bulgarica 15: 115-118.

Vatev I., P. Simeonov. 1978. On some Birds in the south part of the Kresna gorge. - Ornithologica Information Buletin, 4:

Von Stephan Ernst, F. 1978. Ornithologische Ergebnisse einer Exkusion 1974 dureh Bulgarien. - Vogelkd., 24 (5): 281–294.

Voous K. 1960. Die Vogelwelt Europas und ihre Verbreitung. Hamburg. Elsevier. 284 p.

Wetlands International. 2002. Waterbird Population Estimates - Third Edition. Wetlands International Global Series No 12, Wageningen, The Netherlands, 226 p.

Wetlands International. 2006. Waterbirds Population Estimates: Forth Edition. Wageningen, The Netherlands, 239 p.

Yeatman L. 1971. Histoire des oiseaux d’Europe. Bordas, Paris: 376 p.

Yosef R., L. Fornasari 2004. Simultaneous decline in Steppe Eagle (Aquila nipalensis) populations and Levant Sparrowhawk (Accipiter brevipes) reproductive success: coincidence or a Chernobyl legacy? – Ostrich, 75, 1/2: 20-24.

Amphibia and Reptilia

ARNTZEN, J. W. (2003): Triturus cristatus Superspezies - Kammolch-Artenkreis (Triturus cristatus (Laurenti, 1768) - Nördlicher Kammolch, Triturus carnifex (Laurenti, 1768) - Italienischer Kammolch, Truturus dobrogicus (Kiritzescu, 1903) - Donau-Kammolch, Triturus karelinii (Strauch, 1870) - Südlicher Kammolch). - in Grossenbacher, K. & B. Thiesmeier (Eds.): Handbuch der Reptilien und Amphibien Europas. Band 4/IIA. – Wiesbaden (Aula), 421-514.

BARTOSHIK, М., V. BESHKOV. 1979. New species for the Bulgaria’s fauna. – Priroda i Znanie, Sofia, 30(6): 39. (In Bulgarian)

BARTOSHIK, M., V. BESHKOV, V. TZÉNOV. 1981. Morphologie et répartition de Coluber rubriceps (Venzmer, 1919) (Colubridae, Serpentes) en Bulgarie. – Acta Zoologica Bulgarica, 17: 52-57.

BESHKOV, V. 1959. A new snake for Bulgaria’s fauna. – Priroda, Sofia, 1: 89. (In Bulgarian)

BESHKOV V. 1961. Beitrag zur zoogeografischen Untersuchung der Herpetofauna in Bulgarien.- Bulletin de l’Institut de Zoologie et Musée, Sofia, 10: 373-383. (In Bulgarian)

BESHKOV, V. 1967. Grass-snakes in Bulgaria. Priroda i Znanie, Sofia, 9: 16-18. (In Bulgarian)

BESHKOV, V. 1973. Über die subspecifische Zugehörigkeit der bulgarichen Vipera ursinii (Bonaparte, 1835) (Serpentes). - Bull. Inst. zool. mus. Sofia, 37: 103-112. (In Bulgarian)

BESHKOV, V. 1974. Die Höhenverteilung der Schlangen einer, ihrer Artenvielfalt nach specifischen Region von Südostbulgarien. – Bull. Inst. zool. mus. Sofia, 40: 167-173. (In Bulgarian)

BESHKOV, V. 1978. Studies on the biology and ecology of the snakes in Maleshevska Mountain. – PhD. thesis, Inst. Zool., BAS. (In Bulgarian)

BESHKOV, V. 1981a. Leopard snake. – Priroda i Znanie, 7: 24. (In Bulgarian)

BESHKOV, V. 1981b. And he need of our protection. Priroda i Znanie, 9: 16-18. (In Bulgarian)

BESHKOV, V. 1984. On the distribution and relative abundance and protection of tortoises in Bulgaria.– Ecology, 14: 14-34. (In Bulgarian)

BESHKOV, V. 1985. Amphibians. Reptiles. – In: Bulgarian Red data book. Vol. 2. Animals. Sofia, BAN: 32-41. (In Bulgarian)

BESHKOV, V. 1987. Number of the stripe-necked terrapin (Mauremis caspica rivulata (Valenciennes)) in Bulgaria. – Ekology, 20: 58-64. (In Bulgarian)

BESHKOV, V. 1997. Record-sized tortoises, Testudo graeca ibera and Testudo hermani boettgeri, from Bulgaria. – Chelonian Conservation and Biology, 2 (4): 593-596.

BEŠKOV, V., P. BERON. 1964. Catalogue et bibliographie des Amphibiens et des Reptilies en Bulgarie. Sofia, ABS. 39 pp.

BESHKOV, V., K. NANEV. 2002. Amphibians and reptiles in Bulgaria. Pensoft, Sofia-Moscow. 120 pp. (In Bulgarian)

BESHKOV V., E. UNDJIYAN, S. SIMEONOV, A. DARAKCHIEV. 1967. Neue Angaben über die Verbreitung einiger Amphibien und Reptilien in Bulgarien.- Bull. Inst. zool. mus. Sofia,, Sofia, 25: 5–10. (In Bulgarian)

BURESCH I., BESHKOV V. 1965. Wird die Giftschlange Vipera aspis L. in Bulgarien angetroffen? - Bull. Inst. zool. mus. Sofia, 18: 5-30. (In Bulgarian)

BURESCH I., J. ZONKOV. 1933. Untersuchungen über die Verbreitung der Reptilien und Amphibien in Bulgarien und auf der Balkanhalbinsel. 1. Schildköten (Testudinata) und Eidechsen (Sauria). – Mitt. Königl. Naturwiss. Inst. Sofia, 6: 150-207. (In Bulgarian)

BURESCH I., J. ZONKOV. 1934. Untersuchungen über die Verbreitung der Reptilien und Amphibien in Bulgarien und auf der Balkanhalbinsel. 2. Schlangen (Serpentes). - Mitt. Königl. Naturwiss. Inst. Sofia, 7: 106-188. (In Bulgarian)

BURESCH I., J. ZONKOV. 1941. Untersuchungen über die Verbreitung der Reptilien und Amphibien in Bulgarien und auf der Balkanhalbinsel. 3. Schwanzlurche (Amphibia, Caudata). - Mitt. Königl. Naturwiss. Inst. Sofia,, 14: 171-237. (In Bulgarian)

CHLEBICKI, A. 1985. Notaki herpetologiczne z gor Sakar (Tracija). – Przegl. Zool., 29 (2): 193-198.

HRISTOV K., RUSSEV G., WESTERSTRÖM A., BESHKOV V. 2004. New records of Vipera ursinii (Bonaparte, 1835) in Bulgaria. – Historia Naturalis bulgarica, 16: 119-121.

KOVACHEV, V. 1894. Materials for studying the Bulgarian fauna. – Periodical juournal, XLVI (year IX): 742-749. (In Bulgarian)

KOVATSCHEFF, V. 1903. Beiträge zur Kenntnis der Reptilien- und Amphibienfauna Bulgariens. – Verhandl. Zool.-Bot. Geselschaft in Wien, Jahrg. 1903: 171-173.

KOVATSCHEFF, V. 1905. Beiträge zur Kenntnis der Reptilien- und Amphibienfauna Bulgariens 2. – Verhandl. Zool.-Bot. Geselschaft in Wien, LV: 31-32.

KOVACHEV, V. 1912. The herpetofauna of Bulgaria. Plovdiv, Ch. G. Danov. 90 pp. (In Bulgarian)

LITVINCHUK, S., L. BORKIN. 2002. Distribution, Ecology and Conservation Status of the Danube Crested Newt Triturus dobrogicus (Amphibia, Salamandridae) in Ukraine and Moldova. Vestnik zoologii, 36(3): 35-44. (In Russian)

MÜLLER, L. 1933. Beiträge zur Herpetologie der südeuropäischen Halbinsel. 2. Herpetologisch Neues aus Bulgarien. – Zool. Anzeiger (Leipzig), 104: 1-14.

NAUMOV, B. 2005. New Records of Some Herpetofauna Species in Bulgaria. – Acta zoologica bulgarica, 57 (3): 391-396.

NAUMOV, B. 2006. A New Record of Eryx jaculus (Reptilia: Boidae) in Bulgaria. – Acta zoologica bulgarica, 58 (1): 143-144.

NILSON G., C. ANDRÉN. 2001. The meadow and steppe vipers of Europe and Asia – the Vipera (Acridophaga) ursinii complex. Acta Zoologica academiae Scientiarum Hungaricae, 47(2/3): 87-267.

OBST, F. J. 1978. Zur geographischen Variabilität des Scheltopusik, Ophisaurus apodus (Pallas) (Reptilia, Squamata, Anguidae). Zool. Abh. Staatl. Mus. für Tierkunde in Dresden, 35(8): 129-140.

OBST, F. J. 1981. Bemerkenswerte Schlangen aus Bulgarien in unserer Sammlung: Coluber rubriceps Venzmer und Elaphe situla (L.). Faunistische Abhandlungen, Staatliches Museum für Tierkunde in Dresden, 8(17) [1980]: 177-180.

PESHEV, D., D. MITEV. 1987. Species composition of amphibians, reptiles and mammals in the region of v. Drama, distr. Yambol. – Trav. Sci. Univ. Plovdiv “P. Hilendarski”, 25 (6) - Biologie: 101-106. (In Bulgarian)

PESHEV, D., V. DELOV, N. TZANKOV, A. VASILEV. 2005. Specific characteristic and distribution trends of the vertebrate fauna in the basin of Rilska river. – Annuaire de l’Université de Sofia "St. Kliment Ohridski" 2004, 96, livre 4 - 10éme session scientifique, Sofia ’03, partie 2: 177-189.

PETROV, B. 2004. The herpetofauna (Amphibia and Reptilia) of the Eastern Rhodopes (Bulgaria and Greece). – In: Beron, P., A. Popov (eds.). Biodiversity of Bulgaria 2. Biodiversity of Eastern Rhodopes, Bulgaria and Greece. Pensoft & Nat. Mus. Natur. Hist., Sofia : 863-879.

PETROV, B., S. HRISTOVA, H. HRISTOV. 2002. First record of the Cat snake Telescopus fallax Fleischmann, 1831 (Reptilia: Serpentes) in the Eastern Rhodopes Mt., Bulgaria. – Historia naturalis bulgarica, 15: 143-146.

PETROV, B., P. STOEV, V. BESHKOV. 2001. A review on the species composition and distribution of the amphibians (Amphibia) and reptiles (Reptilia) in the Eastern Rhodops Mountain, Bulgaria. – Historia naturalis bulgarica, 13: 127-153. (In Bulgarian)

Petrov B., N. Tzankov, H. Strijbosch, G. Popgeorgiev, V. Beshkov. 2006. The herpetofauna (Amphibia and Reptilia) of the Western Rhodopes mountain (Bulgaria and Greece). - In: Beron P. (ed.) Biodiversity of Bulgaria. 3. Biodiversity of Eastern Rhodopes (Bulgaria and Greece). Pensoft & Nat. Mus. Natur. Hist., Sofia, 863-912.

REHÁK, I. 1985. Coluber rubriceps thracius ssp. n. from Bulgaria. – Vĕstnik československé společnosti zoologické, Praha, 49: 276-280.

REHÁK, I. 1986. Taxonomic evaluation of Coluber rubriceps (Venzmer, 1919) from Bulgaria. In: Roček, Z. (ed.), Studies in Herpetology. Prag, Charles University, pp. 289-292.

SAINT GIRONS H. (1997): Vipera aspis (Linnaeus, 1758), In: Gasc J. P. et al. Atlas of Amphibians and Reptiles in Europe, p. 386-387.

SHISHKOV, G. 1914. Two new species for the Bulgarian herpetofauna.. – Ann. Sofia Univ., 8-9: 1-9. (In Bulgarian)

STOEV, P. 2000. On the distribution, biology and ecology of amphibians and reptiles in the Derventski Heights and the Sakar Mountain, South-East Bulgaria. – Historia naturalis bulgarica, 12: 59-69.

TZANKOV, N. 2005. Sympatric distribution of six lacertid lizards. – Annuaire de l’Université de Sofia "St. Kliment Ohridski" 2004, 96, livre 4 - 10ème session scientifique, Sofia ’03, partie 2: 235-242.

UNDJIYAN, E. 2000. Die Lurche und Ktiechtiere des Lomtales und des Naturparkes "Russenski Lom" Bezirke Russe und Rasgrad Nordostbulgarien. Priroden park "Rusenski Lom". 88 pp. (In Bulgarian)

VASILEV, V., I. RAYKOV, D. VLADIMIROV. 2006. A record of Blotched Snake Elaphe sauromates near Shumen town. – Godishnik na Shumenskiya Universitet “Episkop Konstantin Preslavski” Fakultet po Prirodni Nauki, 16B: 133-134. (In Bulgarian)

VESSELINOV D. 1994. Characterization of the habitats, distribution and conservation of Alpine Newt (Triturus alpestris /Laurenti, 1768/) in Bulgaria. – Dipl. thesis, Fac. Biol., Sofia Univ. St. Kliment Ohridski. 78 pp. (In Bulgarian)

VALKANOV, А. 1938. Smolyanski lakes. Fishing review, 8: 101-103. (In Bulgarian)

WERNER, F. 1898. Prilozi poznavanju faune Reptilija I Batrahija Balkanskog Poluostrova. – Glasnik Zemaljskog muzeja u Bosni i Hercegovini, Sarajevo, 10 (1): 131-156.

Fishes

Apostolou A. 2005. The ichthyofauna from the Bulgarian Sector of the Mesta River. – Acta zoologica bulgarica, 57 (2): 191-196.

Banarescu P. 1964. Pisces, Osteichthyes. Fauna Republici Populare Romine XIII. Bucuresti, 961 p.

Banarescu P. 1969. Cyclostomata si Chondrichthyes. Fauna Republici Populare Romine XII. Bucuresti, 102 p.

Banarescu P. 1999. Gobio kessleri Dybowski, 1862. - In: Banarescu P. (Ed.), The Freshwater Fishes of Europe. Vol. 5 / I. Cyprinidae 2 / I. AULA-Verlag, Wiesbaden, 135-162.

Banarescu P., N. Bogutskaya, Y. Movchan, A. Smirnov 2003. Barbus barbus (Linnaeus, 1758). - In: Banarescu P., N. Bogutskaya (Eds.), The Freshwater Fishes of Europe. Vol. 5 / II. Cyprinidae 2 / II: Barbus. AULA-Verlag, Wiebelsheim, 43-98.

Banister K. 1986. Gasterosteidae. – In: Whitehead P.J.P., M.-L. Bauchot, J.-C. Hureau, J. Nielsen, E. Tortonese (Eds.), Fishes of the North-Eastern Atlantic and the Mediterranean. 2. UNESCO, Paris, 640-643.

Berg L. S. 1948. Freshwater fishes of the USSR and adjacent countries. I. Moscow, 466 p. (In Russian)

Berg L. S. 1949. Freshwater fishes of the USSR and adjacent countries. II. Moscow, 560-925. (In Russian)

Berg L. S. 1949. Freshwater fishes of the USSR and adjacent countries. III. Moscow, 970-1331. (In Russian)

Botev B., T. Peshev (Eds.) 1985. Red Book of the Republic of Bulgaria, Vol. 2, Animals. BAS, Sofia, 183 p. (In Bulgarian)

Bulgurkov K. 1958. Fish fauna of the rivers of Mountain Vitosha and of the adjacent Dams. – Bulletin de l’Institut Zoologique de l’Academie des Sciences de Bulgarie, 7: 163-194. (In Bulgarian)

Bulgurkov K. 1958a. Hydrological peculiarities of the reservation of Lake Srebarna and composition of its fish fauna. – Bulletin de l’Institut Zoologique de l’Academie des Sciences de Bulgarie, 7: 251-263. (In Bulgarian)

Bulgurkov K. 1968. Food and distribution of the commercial turbot – Rhombus maeoticus (Pallas) during 1964-1966. – Proceedings of the Research Institute of Fisheries and Oceanography – Varna, 9: 57-84. (In Bulgarian)

Chichkoff G. 1912. Contribution à l'étude de la faune de la mer Noire. Animaux récoltés sur les côtes Bulgares. - Archives de Zoologie Expérimentale et Générale, (5)10, notes et revue: 29-39.

Chichkoff G. 1929. Sur un nouveau poisson du genre Gobio Cuvier: G. similis n. sp. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 25 (3): 158-171. (In Bulgarian)

Chichkoff G. 1930. Description de Squalius borysthenicus Kessler trouve dans les eaux douces de la Bulgarie. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 26 (2): 5-16. (In Bulgarian)

Chichkoff G. 1932. Neuveaux poissons d’eau douce de la Bulgarie. - Travaux de la Societe Bulgare des sciences naturelles, Sofia, 15-16: 355-376. (In Bulgarian)

Chichkoff G. 1934. Sur la faune ichthyologique de la Kamtchia. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 30 (3): 131-187. (In Bulgarian)

Chichkoff G. 1934a. Sur la presence de Chalcalburnus chalcoides derjugini (Berg) en Bulgarie. - Bull. de l’Inst. Royales d’histoire naturelle a Sofia, Bulgarie, 7: 61-65.

Chichkoff G. 1935. Description d’Un Barbeau Nouveau – Barbus barbus bergi n. subsp. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 31 (3) : 305-314. (In Bulgarian)

Chichkoff G. 1936. Some words about the fish fauna of Kamchia. – Ribarski pregled, 6 (7): 100-102. (In Bulgarian)

Chichkoff G. 1937. Sur les Goujons habitant les eaux douces de la Bulgarie. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 33 (3): 227-289. (In Bulgarian)

Chichkoff G. 1939. Some information on the fishing in the Iskar River. - Fishery Research, 9 (8): 4-7. (In Bulgarian)

Chichkoff G. 1939a. Poissons nouveaux et peu connus des eaux douces de la Bulgarie. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 35 (3): 91-199. (In Bulgarian)

Dikov T., M. Zivkov 2004. Abundance and biomass of fishes in the Veleka River, Bulgaria. - Folia Zoologica, 53 (1): 81-86.

Dikov T., J. Jankov, S. Jocev 1988. Ichthyofauna composition, number and biomass of different species in the River Palakarija, a tributary to the River Iskar. – Hydrobiology, Sofia, 33: 59-67. (In Bulgarian)

Dikov T., J. Jankov, S. Jocev 1994. Fish stocks in rivers of Bulgaria. - Polskie Archiwum Hydrobiologii, 41 (3): 377-391.

Dimitrov M. 1957. Hydrological and hydrobiological characteristics of Al. Stambolijski Reservoir. - Arbeiten des Zentralen Forschungsinstitutes für Fischzucht und Fischerei, Varna, Zemizdat Publ., 1: 159-197. (In Bulgarian)

Drensky P. 1921. Fish and fisheries on Iskar River. – Agriculture Reports, 2 (9): 5-16. (In Bulgarian)

Drensky P. 1921а. The fish fauna of Iskar River and the fisheries in it. – Estestvoznanie i Geografija, 6 (2/3): 49-58. (In Bulgarian)

Drensky P. 1923. Contribution a l’etude des pissons de la Mer Noire recoltes sur les cotes bulgares. J. BAS, Sofia, 25: 59-112. (In Bulgarian)

Drensky P. 1924.Guide to our Black Sea fishes. – Travaux de la Societe Bulgare des sciences naturelles, Sofia, 11: 50-64. (In Bulgarian)

Drensky P. 1924a. Benthophilus macrocephalus - new fish species for the Danube River. – Travaux de la Societe Bulgare des sciences naturelles, Sofia, 11: 1-4. (In Bulgarian)

Drensky P. 1925. Eel - Anguilla vulgaris. - Lovets, 10: 15-17. (In Bulgarian)

Drensky P. 1928. Die Fische der Familie Cobitidae in Bulgarien. - Bull. de l’Inst. Royales d’Histoire Naturelle a Sofia – Bulgarie, 1: 156-181. (In Bulgarian)

Drensky P. 1930. Zur Kenntnis des Süsswasserfischfauna Bulgariens. - Zoologische Jahrbücher, Abteilung für Systematik, Ökologie und Geographie der Tiere, 59: 669-680.

Drensky P. 1931. Zür Kenntnis der Fischfauna der bulgarischen Küste des Schwarzen Meer. – Agriculture Reports, 12 (7/8): 3-41. (In Bulgarian)

Drensky P. 1934. Alosa bulgarica n. sp. One unknown fish from Bulgarian Black Sea tributaries south of Burgas. - Proceedings of the Natural-Scientific Institutes, Sofia, 7: 79-87. (In Bulgarian)

Drensky P. 1935. Petromyzontiden (Pisces) aus dem Donaugebiet. – Sitzungsbericht der Gesellschaft naturforschender Freunde, Berlin, 102-106.

Drensky P. 1943. Chalcalburnus chalcoides Güld. in Bulgarien. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 39 (3): 343-360. (In Bulgarian)

Drensky P. 1948. Synopsis and distribution of fishes in Bulgaria. – Annulaire de l’Universite de Sofia, Faculte de Sciences, 44 (3): 11-71. (In Bulgarian)

Drensky P. 1951. Fishes of Bulgaria. Fauna of Bulgaria. II. BAS, Sofia, 270 p. (In Bulgarian)

Drensky P. 1951a. Distribution of Leuciscus borysthenicus Kessler in Bulgaria. – Bulletin de l’Institut Zoologique de l’Academie Bulgarie des Sciences, 1: 340-343. (In Bulgarian)

Froese R., D. Pauly (Eds.) 2006. FishBase. World Wide Web Electronic Publication, www.fishbase.org Version (06/2006).

Gheorghiev J. 1953. Une forme inconnue dans l’ichtyofaune Bulgare – Benthophiloides brauneri Beling et Iljin. – Bulletin de l’Institut Zoologique de l’Academie Bulgare des Sciences, 2: 359-372. (In Bulgarian)

Gheorghiev J. 1966. Composition d’espece et caracteristique des Gobiides (Pisces) en Bulgarie. – Proceedings of the Research Institute of Fisheries and Oceanography – Varna, 7: 159-228. (In Bulgarian)

Gheorghiev J. 1967. Composition d`espece de l`ichthyofaune des lacs Bulgares de la Mer Noire. – Proceedings of the Research Institute of Fisheries and Oceanography – Varna, 8: 211-227. (In Bulgarian)

Gheorghiev J., G., K. Alexandrova, D. Nikoloff 1960. Observations sur la reproduction des poissons le long du littoral Bulgare de la Mer Noire. – Bulletin de l’Institut Zoologique de l’Academie des Sciences de Bulgarie, 7: 255-292. (In Bulgarian)

Hoestlandt H. (Ed.) 1991. Clupeidae, Anguillidae. Volume 2. The Freshwater Fishes of Europe. AULA-Verlag, Wiesbaden, 447 p.

Holcik J. 1995. Geographische Verbreitung von Neunaugen (Petromyzontiformes) in der mittleren und unteren Donau (zwischen Österreich und dem Schwarzen Meer). – Fischokologie, 8: 23-30.

Holcik J. 1998. Ichtyologia. Priroda Publ., 310 p.

Holcik J., C. Renaud 1986. Eudontomyzon mariae (Berg, 1931). In: Holcik J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / I. Petromyzontiformes. AULA-Verlag, Wiesbaden, 165-185.

Holcik J., R. Kinzelbach, L. Sokolov, V. Vasil’ev 1989. Acipenser sturio Linnaeus, 1758. – In: Holcik J. (Еd.): The Freshwater Fishes of Europe. Volume 1 / II: General Introduction to Fishes; Acipenseriformes. AULA-Verlag, Wiesbaden, 367-394.

Karapetkova M. 1972. L’Ichthyofauna de la Riviere Yantra. – Bulletin de l’Institut de Zoologie et Musee, 36: 149-182. (In Bulgarian)

Karapetkova M. 1974. Ichtyofaune de la Riviere Kamtchia. - Bulletin de l’Institut de Zoologie et Musee, 39: 85-98. (In Bulgarian)

Karapetkova M. 1975. Ichthyofauna of the Veleka River. - Hydrobiology, Sofia, 1: 54-64. (In Bulgarian)

Karapetkova M. 1976. Composition et caractere de l’ichtyofaune des rivieres bulgares se jetant dans la mer Noire. - Hydrobiology, Sofia, 4: 52-59. (In Bulgarian)

Karapetkova M. 1994. Vertebrate Animals. – In: Russev B. (Ed.), Limnologie der Bulgarischen Donauzuflüsse. MEW, BAS, Sofia, 175-186. (In Bulgarian)

Karapetkova M., T. Dikov 1986. On the composition, distribution, number and biomass of the ichthyofauna of the River Vit. - Hydrobiology, Sofia, 28: 3-14. (In Bulgarian)

Karapetkova M., I. Pechev 1973. L’Ichtyofaune de la Riviere Ropotamo. - Bulletin de l’Institut de Zoologie et Musee, 38: 183-194. (In Bulgarian)

Karapetkova M., E. Undzian 1988. The ichthyofauna of the river valley of the Roussenski Lom River. - Hydrobiology, Sofia, 32: 44-50. (In Bulgarian)

Karapetkova M., M. Zivkov 1995. Fishes of Bulgaria. Gea-Libris Publ., Sofia, 247 p. (In Bulgarian)

Karapetkova M., Ts. Dikov, M. Zivkov, T. Trichkova 2003. Changes in the ichthyofauna of the Veleka River (the Black Sea Basin, Bulgaria). – In: Genov I. (Ed.), The 12th International Symposium “Ecology 2003”, 3-5 June, Bulgaria, Scientific Publications, Vol. II. Ecology, Book 1: 235-243.

Kolarov P. 1960. A rare finding in the Danube River – lamprey Eudontomyzon danfordi Regan, 1911. - Priroda, 3: 70. (In Bulgarian)

Kolarov P. 1978. Einige Änderungen in der Population von Alosa kessleri pontica Eichw. bei ihren Wanderungen zu den Laichplätzen. - In: Russev B., W. Naidenow (Eds.), Limnologie des bulgarischen Donauabschnitts. Bulgarische Akademie der Wissenschaften, Sofia, 238-249. (In Bulgarian)

Kolarov P. 1991. Alosa maeotica maeotica (Grimm, 1901). In: Hoestlandt H. (Ed.), Clupeidae, Anguillidae. Vol. 2. The Freshwater Fishes of Europe. AULA-Verlag, Wiesbaden, 309-322.

Konstantinov V. 1964. Die Gewerbliche Fischerei in Bulgarien von 1940 bis 1958. – Bulletin du l’Institut de Pisc. Pech. – Varna, 4: 125-187. (In Bulgarian)

Konsulov S. 1921. The eel. - Priroda, 2: 18-19. (In Bulgarian)

Kovatcheff V. 1921. An attempt for studying the ichthyofauna of the Maritsa River and its tributaries. - Travaux de la Societe Bulgare des sciences naturelles, Sofia, 9: 90-94. (In Bulgarian)

Kovatcheff V. 1923. Faune des poissons d’eau douce en Bulgarie. – Archives du Ministere de l’Agriculture et des Domaines du Royaume de Bulgarie, 3: 1-164. (In Bulgarian)

Maitland P. 2000. Guide to freshwater fish of Britain and Europe. Octopus Publishing Group Limited, London, 256 p.

Manolov Z., J. Sivkov 1977. Morphometrische Characteristik des Varlovka-Fisches – Leucaspius delineatus (Heckel) im Fluss Kamcjia. - Bulletin du Musee National de Varna, 13 (28): 215-218. (In Bulgarian)

Margaritov N. 1964. Ichthyoparasitenfauna des Stausees “Batak”. –Annuaire de l’Universite de Sofia, Faculte de Biologie, Geologie et Geographie, 56 (1): 105-123. (In Bulgarian)

Marinov B. 1964. Ein neuer Fundort von Leuciscus borysthenicus (Kessler) in der System des Ägäischen Meeres. – Annuaire de L’Universite de Sofia, Faculte de Biologie, Geologie et Geographie, 56 (1): 227-237. (In Bulgarian)

Marinov B. 1966. Über die fischfauna des Bulgarischen Donausectors. – Bulletin de l’Institut de Zoologie et Musee, 20: 139-155. (In Bulgarian)

Marinov B. 1967. Gobio albipinnatus Lukasch, 1933 – a new fish species in Bulgaria. – Annuaire de l’Universite de Sofia, Faculte de Biologie, 59 (1): 39-41. (In Bulgarian)

Marinov B. 1978. Die Fischfauna im bulgarischen Donauabschnitt und ihre Bedeutung für die Wirtschaft. - In: Russev B., W. Naidenow (Eds.), Limnologie des bulgarischen Donauabschnitts. Bulgarische Akademie der Wissenschaften, Sofia, 201-228. (In Bulgarian)

Marinov B. 1989. Taxonomy, faunistics and bionomy of some genera from the families Cyprinidae and Cottidae. – PhD Thesis, Biological Faculty, Sofia University “St. Kliment Ohridski”, 209 p. (In Bulgarian)

Marinov B., C. Dikov 1986. Cottus gobio haemusi subsp. n. (Pisces, Cottidae) from Bulgaria. - Acta zoologica bulgarica, 31: 18-23.

Michailova L. 1965. Über die Ichthyofauna Thrakiens. In: Paspalev G. (Ed.), Die Fauna Thrakiens. II. Verlag der Bulgarischen Akademie der Wissenschaften, Sofia, 265-288. (In Bulgarian)

Michailova L. 1965a. Untersuchungen über die Fischfauna des Struma-Flüsses. – Bulletin de l’Institut de Zoologie et Musee, 19: 55-71. (In Bulgarian)

Michailova L. 1967. Seltene Fischarten aus der Süsswasserfauna Bulgariens. – Zeitschrift für Fischerei und deren Hilfswissenschaften, 15 (1/2): 153-160.

Michailova L. 1970. Die Fische im Westlichen Balkangebirge. - Bulletin de l’Institut de Zoologie et Musee, 31: 19-43. (In Bulgarian)

Miller P. 1986. Gobiidae. – In: Whitehead P.J.P., M.-L. Bauchot, J.-C. Hureau, J. Nielsen, E. Tortonese (Eds.), Fishes of the North-Eastern Atlantic and the Mediterranean. Volume 3. UNESCO, Paris, 1019-1085.

Miller P. (Ed.) 2004. Gobiidae 2. The Freshwater Fishes of Europe, Volume 8 / II. AULA-Verlag, Wiesbaden, 477 p.

Ministry of Agriculture and Forestry 2002-2005. Analysis of current state and perspectives on fishes and other aquatic organisms - In: Annual Bulletins of Ministry of Agriculture and Forestry, www.mzgar.government.bg.

Morov T. 1931. The freshwater fishes of Bulgaria. Sofia, 93 p. (In Bulgarian)

Naseka A., N. Bogutskaya, P. Banarescu 1999. Gobio albipinnatus Lukasch, 1933. - In: Banarescu P. (Ed.), The Freshwater Fishes of Europe. Vol. 5 / I. Cyprinidae 2 / I. AULA-Verlag, Wiesbaden, 37-68.

Paspalev G., T. Peshev 1955. Contribution to the study of the ichthyofauna in the Iskar River. – Annuaire de l’Universite de Sofia, Faculte de Biologie, Geologie et Geographie, 48 (1): 1-39. (In Bulgarian)

Pechev I. 1966. Revue de l’Ichthyofaune de la Riviere d’Elechnitza. – Bulletin du Musee National a Varna, 2 (17): 179-191. (In Bulgarian)

Pechev I. 1969. Au sujet de l’ichthyofaune de quelques rivieres Bulgares se jetant dans la Mer Noire. – Bulletin du Musee National a Varna, 5 (20): 213-220. (In Bulgarian)

Pechev I. 1970. La faune ichthyologique de certaines rivieres de Bulgarie. – Bulletin du Musee National – Varna, 6: 143-156. (In Bulgarian)

Pechev I. 1971. Systematical revision of the barbels (genus Barbus Cuvier) in the rivers from the Bulgarian Black Sea basin. – Voprosi ihtiologii, 11 (3): 408-417. (In Russian)

Pehlivanov L. 1999. State of the ichthyofauna in Ropotamo Reserve Complex: ecological, conservation and economic aspects. - Water Science and Technology, 39 (8): 201-206.

Pehlivanov L. 2000a. Ichthyofauna in the Srebarna Lake, the Danube Basin: state and significance of the management and conservation strategies of this wetland. – International Association for Danube Research, 33: 317-322.

Pehlivanov L. 2000b. Ichthyofauna of the East Rhodopes (South Bulgaria): composition and distribution. – Acta zoologica bulgarica, 52 (3): 45-53.

Penczak T., J. Jankov, T. Dikov, M., Zalewski 1985. Fish production in the Mesta River, Rila Mountain, Bulgaria. - Fisheries Research, 3: 201-221.

Pirogovskii M., L. Sokolov, V. Vasil’ev 1989. Huso huso (Linnaeus, 1758). – In: Holcik J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / II. General Introduction to Fishes; Acipenseriformes. AULA-Verlag, Wiesbaden, 156-200.

Punchuk V., P. Miller 2004. Benthophilus stellatus (Sauvage, 1874). In: Miller P. (Ed.), Gobiidae 2. The Freshwater Fishes of Europe, Volume 8 / II. AULA-Verlag, Wiesbaden, 257-267.

Ragimov D., T. Stepanova, I. Mitrofanov 2007. Benthophilus stellatus (Sauvage, 1874). Available at: http://www.caspianenvironment.org/biodb/eng/fishes/Benthophilus%20stellatus/main.htm.

Renaud C., J. Holcik 1986. Eudontomyzon danfordi Regan, 1911. In: Holcik J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / I. Petromyzontiformes. AULA-Verlag, Wiesbaden, 146-161.

Shubina T., A. Popova, V. Vasil’ev 1989. Acipenser stellatus Pallas, 1771. – In: Holcik J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / II. General Introduction to Fishes; Acipenseriformes. AULA-Verlag, Wiesbaden, 395-443.

Sivkov J. 1974. The ichthyofauna of the Devnja River. - Bulletin du Musee National de Varna, 10 (25): 374-377. (In Bulgarian)

Sivkov Y. 1985. Morphological characteristics of Gymnocephalus baloni Holcik et Hensel, 1974 (Pisces, Percidae) - a new species to the Bulgarian ichthyofauna. – Acta zoologica bulgarica, 27: 10-20. (In Russian)

Sivkov Y. 1986. Biometrical study on the Gymnocephalus schraetser(L.) (Pisces, Percidae)from the Bulgarian section of the Danube. - Bulletin du Musee National de Varna, 22 (37): 161-168. (In Bulgarian)

Sivkov J. 1987. Morphometric characteristics of Stizostedion volgense (Gmelin, 1788) (Pisces, Percidae) from the Bulgarian section of the Danube. - Bulletin du Musee National de Varna, 23 (38): 204-211. (In Bulgarian)

Sivkov Y. 1987a. Morphometric characteristics of Zingel streber Siebold, 1863 (Pisces, Percidae) from the Bulgarian section of the Danube. - Bulletin du Musee National de Varna, 23 (38): 198-204. (In Bulgarian)

Sivkov Y. 1989. Morphological characterization of the Gudgeon (Gobio albipinnatus Lukasch, 1933) (Pisces, Cyprinidae) from the Bulgarian section of the Danube River. – Acta zoologica bulgarica, 38: 11-15. (In Bulgarian)

Sivkov Y. 1991. Morphological characterization of the stone loach Noemacheilus barbatulus (L.) (Pisces, Cobitidae) from Bulgaria. – Acta zoologica bulgarica, 42: 27-33.

Sivkov Y. 1991a. Morphological characteristics of the Danubian loach Sabanejewia bulgarica (Drensky, 1928) (Pisces, Cobitidae). – Acta zoologica bulgarica, 42: 34-43.

Sivkov Y. 2000. The ichthyofauna in the coastal area of the Reserve Kaliakra. - Bulletin du Musee National de Varna, 30-31 (45-46): 293-297.

Sivkov J. 2003. The Ichthyofauna of the Bay of Varna. - Bulletin du Musee National de Varna, 34-35 (49-50): 369-376. (In Bulgarian)

Sivkov J. 2003a. Morphological characteristics of the crucian carp Carassius carassius (Linnaeus, 1758) (Pisces, Cyprinidae). - Bulletin du Musee National de Varna, 34-35 (49-50): 445-455.

Sivkov Y., Z. Manolov 1978. Morphologische Charakteristik des Donaufisches Pelecus cultratus (Linne). - Bulletin du Musee National de Varna, 14 (29): 224-229. (In Bulgarian)

Sivkov Y., S. Sivkova 2002. Morphological characteristics of the Black Sea sprat Clupeonella cultriventris (Nordmann, 1840) (Pisces, Clupeidae) from the Bulgarian Black Sea coast. - Bulletin du Musee National de Varna, 32-33 (47-48): 268-273. (In Bulgarian)

Sivkov Y., S. Sivkova 2003. A contribution to the ichthyofauna of the lake of Durankulak. – Symposium „Natural Sciences 2003”, University of Shumen “Konstantin Preslavsky”, 104-107. (In Bulgarian)

Sokolov L., V. Vasil’ev 1989. Acipenser nudiventris Lovetsky, 1828. – In: Holcik, J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / II: General Introduction to Fishes; Acipenseriformes. AULA-Verlag, Wiesbaden, 206-226.

Stefanov T. 2000. Research on the populations of Leuciscus borysthenicus (Kessler) in Bulgaria. – MSc Thesis, Department of Hydrobiology and Ichthyology, Faculty of Biology, Sofia University, 76 p. (In Bulgarian)

Stefanov Т. 2001. Ichthyofauna of Struma River in the part between Kocherinovo railway station and the mouth of Strumeshnica River. - In: P. Beron (Ed.), Biodiversity of Kresna Gorge (SW Bulgaria): 289-296. (In Bulgarian)

Stefanov T. 2004. Ichthyological research in the area of the ancient Straldzha Marsh and Mochuritsa River. - In: Momchilov D., Y. Stateva, N. Chakarova-Krasteva (Eds.), The Nature of Karnobat Region, Vol. 1: 71-81. (In Bulgarian)

Stefanov T., J. Holcik 2007. The lampreys of Bulgaria. Folia Zoologica, 56 (2): 213-224.

Stefanov T., T. Trichkova 2005. Fish species diversity in the Eastern Rhodopes (Bulgaia). In: Beron P., Popov A. (Eds.). Biodiversity of Bulgaria. 2. Biodiversity of the Eastern Rhodopes (Bulgaria and Greece). Pensoft & Nat. Mus. Natur. Hist., Sofia: 849-861.

Stefanov T., T. Trichkova 2006. The Ichthyofauna of the West Rhodope Mountains (Bulgaia). In: Beron P. (Ed.). Biodiversity of Bulgaria. 3. Biodiversity of Western Rhodopes (Bulgaria and Greece) I. Pensoft & Nat. Mus. Natur. Hist., Sofia. 843-861.

Stojanov S. 1949. Gebedjensko Lake. – Priroda i Znanie, 2 (6): 21-22. (In Bulgarian)

Stojanov S. 1952. Leuciscus borysthenicus (Kessler) from the Maritza River system. – Proceedings of the Marine Biological Station - Varna, 17: 1-12 (In Bulgarian)

Stojanov S., J. Gheorghiev, L. Ivanov, D. Hristov, P. Kolarov, K. Aleksandrova, M. Karapetkova 1963. Fishes of the Black Sea. Varna, 246 p. (In Bulgarian)

Svetovidov A. 1964. Fishes of the Black Sea. Nauka Publ., Moscow-Leningrad, 550 p. (In Russian)

Trichkova T., M. Zivkov, M. Karapetkova 2004. Species composition and conservation status of the ichthyofauna in the West Balkan Mountains. - In: Genov I. (Ed.), The 13th International Symposium “Ecology 2004”, 5-7 June, Bulgaria, Scientific Articles, Book 2: 46-52.

Trichkova T., T. Stefanov, S. Mihov, M. Vassilev, M. Zivkov 2006. Species composition and conservation status of the ichthyofauna in the South Black Sea Rivers of Bulgaria. - In: Genov I. (Ed.), The 15th International Symposium “Ecology 2006”, 5-9 June, Bulgaria, Scientific Articles, Part 1: 327-338.

Vassilev M. 1994. On the downstream migration of ichthyoplankton along the Bulgarian shore of the Danube River. – Vie Milieu, 44 (3/4): 273-280.

Vassilev M. 1998. Alteration of the ichthyofauna in the Shabla and Ezerets Lakes. - In: Golemansky V., W. Naidenow (Eds.), Biodiversity of Shabla Lake System, Prof. M. Drinov Acad. Publ. House, Sofia, 101-106.

Vassilev M. 1999. Changes of ichthyofauna in the Durankulak Lake. – Acta zoologica bulgarica, 51 (1): 61-68.

Vassilev M., L. Pehlivanov 2002. The ihthyofauna of the Bulgarian part of the Struma River. – Historia naturalis bulgarica, 14: 103-108. (In Bulgarian)

Vassilev M., L. Pehlivanov 2003. Structural changes of sturgeon catches in the Bulgarian Danube section. – Acta zoologica bulgarica, 55 (3): 97-102.

Vassilev M., L. Pehlivanov 2005. Checklist of Bulgarian freshwater fishes. – Acta zoologica bulgarica, 57 (2): 161-190.

Velkov B., L. Pehlivanov, M. Vassilev 2004. Umbra krameri(Pisces, Umbridae): a reinstated species for the Bulgarian ichthyofauna. - Acta zoologica bulgarica, 56 (2): 233-235.

Vlasenko A., A. Pavlov, L. Sokolov, V. Vasil’ev 1989. – Acipenser gueldenstadti Brandt, 1833. In: Holcik J. (Ed.), The Freshwater Fishes of Europe. Volume 1 / II. General Introduction to Fishes; Acipenseriformes. AULA-Verlag, Wiesbaden, 295-343.

Undzian E. 1964. Über Einen Fund von Neunaugen aus der Donau. – Bulletin du Musee National de Russe, 1: 227-232. (In Bulgarian)

Yankov J. 1971. Weatherfish in the Agean Sea Basin. – Priroda, 3: 73-74. (In Bulgarian)

Zivkov M. 1987. Icthyofauna and fish-farming in the Dospat Reservoir. – Hydrobiology, Sofia, 30: 15-22. (In Bulgarian)

Zivkov M., G. Grupcheva 1987. Specificities of the hydrochemical state, formation of the ichthyofauna and the fish-farming in the Cooling-Reservoir Ovcharitsa. - Hydrobiology, Sofia, 30: 23-36. (In Bulgarian)

Zivkov M., K. Prodanov†, T. Trichkova, G. Raikova-Petrova, P. Ivanova 2005. Fishes in Bulgaria – research priorities, conservation and sustainable use. In: Petrova D. (Ed.), Current State of Bulgarian Biodiversity – Problems and Perspectives, Bulgarian Biodiversity Platform, Drakon Publ, Sofia, 247-282. (In Bulgarian)

Zukov P. 1965. Fishes of Belarus. Minsk, 415 p. (In Russian)

Invertebrates

Abadjiev S. 1995. Butterflies of Bulgaria. Volume 3. Nymphalidae: Apaturinae & Nymphalinae. Sofia (S. Abadjiev). 159 p.

Abadjiev S. 2001. An Atlas of the Distribution of the Butterflies in Bulgaria (Lepidoptera: Hesperioidea & Papilionoidea). Zoocartographia Balcanica, 2: 335 p.

Angelov, A. 1967. Horatia (Hauffenia) lucidulus n. sp., ein neuer Vertreter der Molluskenfauna Bulgariens. - Arch. Moll., 96 (3/6), 145-148.

Angelov, A. 2000. Mollusca (Gastropoda et Bivalvia) aquae dulcis. – In: Catalogus faunae bulgaricae. 4. Sofia-Leiden, Pensoft & Backhuys Publishers BV, 57 p.

Angelov, A. 1984. Pisidium supinum Schmidt, 1850 (Bivalvia, Pisidiidae) has been found in Bulgaria. – Acta zool. bulg., 24, 80-82. (In Bulgarian, English summary)

Apfelbeck V. 1904. Die Käferfauna der Balkanhalbinsel, mit Berücksichtigung Klein-Asien und der Insel Kreta. Erstes Band: Familinreihe Caraboidea. Berlin (R. Friedländer und Sohn). ix + 422 p.

Apostolov, A. 1992. Copépodes Harpacticoïdes cavernicoles de Bulgarie. 3. Description d’un nouveau copépode du genre Parastenocaris Kessler, 1913 de Bulgarie. – Annls Limnol., 28(3): 197-200.

Askew R. 2004. The dragonflies of Europe. Great Horkesley, Essex (Harley Books, Martins). 308 p.

Aspöck H., U. Aspöck, H. Hölzel 1980. Die Neuropteren Europas. Band I. Krefeld (Goecke & Evers). 495 p.

Bae Y.J., W.P. McCafferty 1998. Phylogenetic systematics and biogeography of the Neoephemeridae (Ephemeroptera: Pannota). – Aquatic Insects, 20: 35-69.

Beron P. 1994. Résultats des recherches biospéléologiques en Bulgarie de 1971 à 1994 et liste des animaux cavernicoles bulgares. – Tranteeva, Sofia, 1, 137 pp.

Beron P. & Guéorguiev V. 1967. Essai sur la faune cavernicole de Bulgarie. II. Résultats des recherches biospéléologiques de 1961 á 1965. – Bull. Inst. Zool. Mus., XXIV, Sofia: 151-212.

Beron P. & Mitov P. 1996. Cave Opilionida in Bulgaria. – Hist. nat. bulg. 6: 17-23.

Beschovski V. 1960. A contribution to the order Odonata from high-mountain lakes and bogs in Bulgaria. – Bulletin de l’Institut zoologique de l’Académie des sciences de Bulgarie, 9: 451-453. (In Bulgarian).

Beschovski V. 1964. Odonata from the Bulgarian Black Sea coast. – Bulletin de l’Institut de zoologie et musée, 15: 115-129. (In Bulgarian).

Beschovski V. 1965. Odonata from the Bulgarian riverside of the Danube and from certain water reservoirs in Northern Bulgaria. – Bulletin de l’Institut de zoologie et musée, 18: 159-168. (In Bulgarian).

Beschovski V. 1967. Ecological survey of the larvae of Odonata in the Bulgarian rivers. – Bulletin de l’Institut de zoologie et musée, 24: 5-20. (In Bulgarian).

Beschovski V. 1993. A critical notes on some Odonata species (Insecta, Odonata), reported by Bulgarian authors for the territories of Bulgaria, Greece and Macedonia. Acta zoologica bulgarica, 46: 39-43.

Beschovski V., V. Gashtarov 1997. Selysiothemis nigra (Vander Linden, 1825) a new genus and species for the Bulgarian fauna (Odonata: Anisoptera: Libellulidae). – Entomologische Zeitschrift, 107(7): 309-310.

Boyer S., Karaman I. & Giribet G. 2005. The genus Cyphophthalmus (Arachnida, Opiliones, Cyphophthalmi) in Europe: A phylogenetic approach to Balkan Peninsula biogeography. – Molecular Phylogenetics and Evolution, 36: 554-567.

Brittain J. 1972. Brachycercus harrisella Curtis (Ephemeroptera) new to Norway. – Norsk entomologisk Tidsskrift, 19(2): 171.

Brittain J. 1974. Studies on the lentic Ephemeroptera and Plecoptera of Southern Norway. – Norsk entomologisk Tidsskrift, 21: 135-154.

Bugrov A., S. Grozeva 1998. Neo-XY chromosome sex determination in four species of the pamphagid grasshoppers (Orthoptera, Acridoidea, Pamphagidae) from Bulgaria. – Caryologia, 51(2): 115-121.

Buresch I. 1936. Beitrag zum Studium der Neuropterenfauna Bulgariens. – Mitteilungen der Bulgarischen Entomologischen Gesellschaft in Sofia, 9: 135-150. (In Bulgarian).

Buresch, I. & V. Gueorguiev. 1962. Contribution à la connaissance des espèces du genre Stenasellus (Crustacea, Asellota) en Bulgarie, avec description d’une nouvelle espèce. – Bull. Inst. Zool. et Musée, Sofia, 11: 189-206.

Buresch I., S. Kantardjieva 1928. Die in Bulgarien vorkommenden Arten der Subfamilie Carabinae (Coleopt.-Carabidae). – Mitteilungen aus den Königlichen naturwissenschaftlichen Instituten in Sofia, 1: 45-107. (In Bulgarian).

Buresch I., G. Peschev 1955. Artenbestand und Verbreitung der Geradflügler (Orthoptera) in Bulgarien unter Berücksichtigung der schädlichen Heuschrecken. I. Teil. Acridoidea. – Bulletin de l’Institut zoologique de l’Académie des sciences de Bulgarie, 4/5: 3-107. (In Bulgarian).

Buresch I., G. Peschev 1958. Artenbestand und Verbreitung der Geradflügler (Orthopteroidea) in Bulgarien unter Berücksichtigung der schädlichen Arten. III. Teil – Tettigonioidea. – Bulletin de l’Institut zoologique de l’Académie des sciences de Bulgarie, 7: 3-90. (In Bulgarian).

Chobanov D. 2003. New data on the occurrence of Orthoptera in Bulgaria. – Articulata, 18(2): 227-246.

Csongar G., L. Moczar 1954. A Tiszavirag. – Muzeumi Füzetek, 6: 1-32.

Ćurčić B.P.M., S. Makarov (2000) A revision of some species of Bulgarosoma Verhoeff (Antroleucosomatidae, Myriapoda) from the Balkan peninsula. – Archive of Biological Sciences (Belgrade), 52 (3): 173-178.

D’Aguilar J., J.-L. Dommanget, R. Préchac 1986. A field guide to the dragonflies of Britain, Europe and North Africa. London (Collins). 336 p.

Deltshev C., 1973. A new Troglohyphantes from Bulgarian caves (Araneae, Linyphiidae). Int. J. Speleol. 5: 103-109.

Deltshev C. & Blagoev, G. 2001. A critical chek list of Bulgarian spiders (Araneae). - Bull. Br. Arachnol. Soc., 12(30): 110-138.

Deltshev C., Petrov, B.P. & Mitov P. 2005. Faunistic diversity of Class Arachnida (non Acari) in Bulgaria – present state, importance and perspectives. In: Petrova A. (ed.). Current state of Bulgarian biodiversity – problems and perspectives. Bulgarian Bioplatform, Dragon, Sofia, pp. 129-151. (In Bulgarian English abstract).

Dobosz R., T. Hadaś 1999. Bittacus italicus (O. F. Müller, 1766) (Mecoptera: Bittacidae) w Polsce i na Ukrainie. – Wiadomości entomologiczne, 17 [1998] (3/4): 145-150.

Donath H. 1987. Odonaten von der südbulgarischen Schwarzmeerküste. Notulae Odonatologicae, 2(10): 157-168.

Drensky P 1913. Über die Spinnen-Fauna Bulgariens. - Sbor. Bulg. Akad. Nauk., 2: 1-146. (In Bulgarian, German summary).

Drensky P 1915. Araneides noveaux ou peu connus de Bulgarie. - Spis. Bulg. Akad. Nauk., 12: 141-176. (In Bulgarian, French summary).

Drensky, P. 1936. Katalog der echten Spinnen (Araneae) der Balkanhalbinsel. – Sb. bulg. Akad. Nauk, 32: 1–223.

Drensky, P. 1947. Synopsis and distribution of freshwater Mollusca in Bulgaria. – Godishnik na Sofiiskiya Universitet. Fiziko-matematicheski fakultet (Annuaire de l’Université de Sofia. Faculté physico-mathématique), 43(3): 33-54. (In Bulgarian, English summary).

Elliott J., U. Humpesch 1983. A key to the adults of the British Ephemeroptera with notes on their ecology. – Scientific Publications of the Freshwater Biological Association, 47: 101 p.

Elliott J., U. Humpesch, T. Macan 1988. Larvae of the British Ephemeroptera. A key with ecological notes. – Scientific Publications of the Freshwater Biological Association, 49: 145 p.

Fontan B., M. Brulin, G. Masselot 1999. Redécouverte de Neoephemera maxima (Joly, 1870) pour la France [Ephemeroptera: Neoephemeridae]. – Ephemera, 1(1): 31-34.

Gledhill T. 1959. The life history of Ameletus inopinatus (Siphlonuridae, Ephemeroptera). –Hydrobiologia, Acta Hydrobiologica, Hydrographica et Protistologica, 14: 85-89.

Giribet G. 2000. Catalogue of the Cyphophthalmi of the world (Arachnida, Opiliones). – Revista Ibérica de Arachnología, 2: 49-76.

Golemansky V., J. Lipa 1991. Gregarines (Apicomplexa: Eugregarinida) from cave and terrestrial arthropods in Bulgaria. – Acta Protozoologica, 30: 201-208.

Greve G.D., H.G. van der Geest, S.C. Stuijfzand, A. Kureck, M.H. Kraak 1999. Development and validation of an ecotoxicity test using field collected eggs of the riverine mayfly Ephoron virgo. – Proceedings of Experimental and Applying Entomology, 10: 105-110.

Grossu, A. 1986. Gastropoda Romanie. 1. (Prosbranchia et Opistobranchia). Bucuresti, Litera, 524 p.

Grossu, A. 1993. The Catalogue of the molluscs from Romania. - Trav. Mus. Hist. nat. “G. Antipa”, 33, 291-366.

Guéorguiev V. 1977. La faune troglobie terrestre de la péninsule Balkanique. Origine, formation et zoogéographie. BAN, Sofia, 182 pp.

Guéorguiev V. & Beron P. 1962. Essai sur la faune cavernicole de Bulgarie. – Ann. de Spéléologie, XVII, 2: 285-356; 3: 357-441.

Guéorguiev V., B. Guéorguiev 1995. Catalogue of the ground-beetles of Bulgaria (Coleoptera: Carabidae). Sofia – Moscow (Pensoft Publishers). 279 p.

Harz K. 1975. Die Orthopteren Europas. II. – In: Schimitschek E., K. Spencer (eds.): Series entomologica. Volume 11. The Hague (Dr. W. Junk B.V. Publishers), 939 p.

Hölzel H. 2002. Band 15. Insecta: Megaloptera. – In: Schwoerbel J., P. Zwick (eds.): Süsswasserfauna von Mitteleuropa. Bände 15-17. Heidelberg – Berlin (Spektrum Akademischer Verlag), 1-30.

Ikonomov P. 1961. Eintagsfliegen (Ephemeroptera) Mazedoniens. Fam. Ephemerellidae. – Acta Musei Macedonici Scientiarum Naturalium, 8(3): 53-74. (In Macedonian).

Ioakimoff D. 1926. Neue für die bulgarische Fauna Hemiptera – Heteroptera. – Mitteillungen der Bulgarischen Entomologischen Gesellschaft in Sofia, 3: 49-58. (In Bulgarian).

Islam S., Y. Uzunov, S. Kovachev 1986. Composition and distribution of the macrozoobenthos of the River Struma. – Hydrobiology (Sofia), 28: 15-35. (In Bulgarian).

Janeva I. 1991. Hydrobiological state of the river Ogosta in various periods of study. – Hydrobiology (Sofia), 36: 32-48. (In Bulgarian).

Janeva I., B. Russev 1985. Trends in changes of the hydrobiological and saprobiological state of the Tundža River. II. May – November, 1981. – Hydrobiology (Sofia), 26: 15-36. (In Bulgarian).

Janeva I., B. Russev 1989. Saprobiological state of the Iskar River in the initial years following the putting into operation of the Sofia Purifying Station. – Hydrobiology (Sofia), 34: 3-18. (In Bulgarian).

Jażdżewska T. 1973. Notes on the biology and ecology of the mayfly Ametropus eatoni Brodskij (Ephemeroptera). – Polskie Pismo entomologiczne, 43: 469-477.

Jażdżewska T. 1975. Neoephemera maxima (Joly, 1870) (Ephemeroptera, Neoephemeridae) in Poland. – Polskie Pismo entomologiczne, 45: 227-238.

Josifov M. 1969. Artenzusammensetzung und Verbreitung der Insekten von der Ordnung Heteroptera in Bulgarien. III. – Bulletin de l’Institut de zoologie et musée, 29: 29-82. (In Bulgarian).

Josifov M. 1974. Heteropteren der bulgarischen Schwarzmeerküste. – Bulletin de l’Institut de zoologie et musée, 39: 5-27. (In Bulgarian).

Josifov M. 1981. Heteroptera, Pentatomoidea. – In: Tashev D. (ed.): Fauna Bulgarica. 12. Sofia (Aedibus Academiae scientiarum bulgaricae), 205 p. (In Bulgarian).

Juberthie C. 1991. Sur Trenteeva paradoxa, Opilion troglobie et les Opilions Cyphophthalmes de Bulgarie. – Mém. Biospéol. 18: 263-267.

Jurinitch, S., Drensky., 1917. Contribution a 1'étude des araignées de Bulgarie. Spis. bulg. Akad. Nauk 15: 109-136. (In Bulgarian, French summary).

Kaneva-Abadjieva, V. 1957. Mollusca and Malacostraca im Varnasee. – Trudove na Morskata biologichna stantsiya, Varna (Arbeiten aus der Biologischen Meeresstation Varna), 19: 127-154. (In Bulgarian, English summary).

Karaman I. 2005. Evidence of spermatophores in Cyphophthalmi (Arachnida, Opiliones). – Revue Suisse de Zoologie, 112: 3-11.

Kazlauskas R.S. 1959. Material about the mayflies (Ephemeroptera) in Lithuanian SSR with description of new species Eurylphella lithuanica Kazlauskas and imago Neoephemera maxima (Joly). – Vilniaus valstibinio v. Kapsuko Vardo Universiteto Mokslo darbei, 23(6): 157-174. (In Russian).

Kazlauskas R. 1962. Neue Angaben über die Eintagsfliegenfauna des Baltikums. – Gidrobiologicheskie issledovaniya, 3: 147-150.

Keffermüller M. 1959. Nowe dane dotyczące jętek (Ephemeroptera) z rodzaju Ametropus Alb. i Behningia Lest. – Poznanskie Towarzystwo Przyjaciol Nauk, Prace komisji biologicznej, 19(5): 1-32.

Korniushin, A. 1996. Bivalve molluscs of the superfamily Pisidioidea in the Palaearctic region (Fauna, systematics, phylogeny). Kiev, Nat. Acad. Sci. Ukraine, 175 p. (In Russian, English summary)

Kratochvil J. 1951. Výsledky bulharské biospeologie v jeskyni "Temnata dupka". – Českosl. Kras, IV, 1-2: 8-12.

Kratochvil J. 1958. Die Höhlenweberknechte Bulgariens (Cyphophthalmi und Laniatores). – Práce Brnen. Zákl. ČSAV, Brno, XXX, 9, 375: 372-396.

Kureck A. 1996. Eintagsfliegen am Rhein: Zur Biologie von Ephoron virgo (Olivier, 1791). – Decheniana, Beiheifte, 35: 17-24.

Landa V. 1968. Developmental cycles of Central European Ephemeroptera and their interrelations. – Acta entomologica bohemoslovaca, 65: 276-284.

Landa V., T. Soldán 1985. Distributional patterns, chorology and origin of the Czechoslovak fauna of mayflies (Ephemeroptera). – Acta entomologica bohemoslovaca, 82: 241-268.

Lis J.A. 1999. Burrower bugs of the Old World – a catalogue (Hemiptera: Heteroptera: Cydnidae). – Genus, 10(2): 165-242.

Macan T. 1961. A key to the nymphs of the British species of Ephemeroptera. – Scientific Publications of the Freshwater Biological Association, 20: 64 p.

Madsen B. 1968. A comparative ecological investigation of two related mayfly nymphs. –Hydrobiologia, Acta Hydrobiologica, Hydrographica et Protistologica, 31(3/4): 337-349.

Marinov M., N. Simov 2004. Somatochlora arctica (Zett.) and Leucorrhinia dubia (Vander L.) new for the fauna of Bulgaria (Anisoptera: Corduliidae, Libellulidae). – Notulae odonatologicae 6(3): 34-35.

Markowitsch A. 1909. Die Schmetterlingsfauna der Umgebung von Rasgrad. – Sbornik za narodni umotvoreniya, nauka i knizhnina, 25: 1-38. (In Bulgarian).

Martens J. 1978. Spinnentiere, Arachnida: Weberknechte, Opiliones. - In: Die Tierwelt Deutschlands, 64 Teil, Jena, G. Fischer.

Matic Z. 1964. Description d’un nouveau Lithobiidae cavernicole de Bulgarie (Chilopoda). – Annales de Spéléologie, 19(3): 507-510.

Mitov P. 1994. Siro beschkovi, spec. nov. from Bulgaria (Arachnida, Opiliones, Cyphophthalmi). – Spixiana, 17 (3): 275-282.

Nedelkov N. 1908. Second contribution to the entomological fauna of Bulgaria. – Periodichesko spisanie na Balgarskoto knizhovno druzhestvo v Sofia, 68/19 [1907] (5/6): 411-436. (In Bulgarian).

Nedelkov N. 1909. Our entomological fauna. – Arhiv na Ministerstvoto na narodnoto prosveshtenie, 1(3): 83-135. (In Bulgarian).

Nedelkov N. 1923. Eight contribution to the entomological fauna of Bulgaria – Spisanie na Balgarskata akademiya na naukite, Klon prirodo-matematichen, 25(12): 45-52. (In Bulgarian).

Novak T. 2005. Notes on spermatophores in Cyphophthalmus duricorius Joseph (Arachnida: Opiliones: Sironidae). – Annales, Series historia naturalis, Koper, 15: 277-280.

Pandourski, I. & S. Breskovski, 1995. Origine des Isopodes Cirolanides et Stenasellides dans les eaux souterraines karstiques de la montagne de Stara Planina Occidentale et Moyenne (Bulgarie) en relation avec l`histoire paléogéographique de la région. - Mémoires de biospéologie, Moulis, t. XXII, 115-119.

Peschev G. 1960. Contribution à l’étude des orthoptères en Bulgarie. – Bulletin de l’Institut zoologique de l’Académie des sciences de Bulgarie, 9: 347-353. (In Bulgarian).

Pešev G. 1962a. Unbekannte Geradflüglerarten (Orthoptera) für die Fauna Bulgariens. – Bulletin de l’Institut de zoologie et musée, 11: 181-187. (In Bulgarian).

Pešev G. 1962b. Composition et répartition oecologique des orthoptères de la montagne Bélassitza. – Bulletin de l’Institut de zoologie et musée, 12: 59-107. (In Bulgarian).

Pechev G. 1965. Une nouvelle espèce du Paranocarodes I. Bolivar, 1916 (Orthoptera, Acrididae) de Bulgarie. – Bulletin de l’Institut de zoologie et musée, 19: 73-83. (In Bulgarian).

Pešev G. 1971. Zusammensetzung und Verbreitung der Geradflügler (Orthoptera) in Bulgarien. Ergänzung I. – Bulletin de l’Institut de zoologie et musée, 32 [1970]: 199-228. (In Bulgarian).

Péchev G. 1974. Orthoptères du Rhodope. Répartition et groupement écologiques. – Bulletin de l’Institut de zoologie et musée, 40: 99-131. (In Bulgarian).

Pеchev G. 1975. La faune orthoptèrologique (Orthoptera) des Rhodopes. II. Composition spécifique, distribution et origine. – In: La faune des Rhodopes. Materiaux. Sofia (Éditions de l’Académie bulgare des sciences), 93-120. (In Bulgarian).

Peshev G., E. Andreeva 1986. Orthoptera in Southwest Bulgaria. I. Fauna. – In: Fauna of Southwestern Bulgaria. Part 1. Sofia (Publishing House of the Bulgarian Academy of Sciences), 82-117. (In Bulgarian).

Peshev G., M. Djingova 1974. Orthoptera along the Bulgarian Black Sea Coast. – Bulletin de l’Institut de zoologie et musée, 40: 17-46. (In Bulgarian).

Pešev G., J. Mařan 1963. Étude sur les insectes orthoptères du mont Slavianka (Alibotuš). – Bulletin de l’Institut de zoologie et musée, 14: 27-69. (In Bulgarian).

Petkov P. 1921. Beitrag zur Kenntnis bulgarischen Odonaten. – Annuaire de l’Université de Sofia. Faculté physico-mathématique, 15/16: 1-39. (In Bulgarian).

Popov A. 1981. Die Megalopteren Bulgariens. – Acta zoologica bulgarica, 17: 63-66.

Popov A. 1996. Zur Verbreitung der Myrmeleontiden in Bulgarien (Neuroptera). – Historia naturalis bulgarica, 6: 37-47.

Popov A. 2007a. Distribution of the families of Neuroptera with low species diversity in Bulgaria. – Annali dei Museo civico di Storia naturale di Ferrara, 8 [2005]: 117-130.

Popov A. 2007b. Fauna and zoogeography of the orthopterid insects (Embioptera, Dermaptera, Mantodea, Blattodea, Isoptera, and Orthoptera) in Bulgaria. – In: Fet V., A. Popov (eds.): Biogeography and ecology of Bulgaria. Dordrecht (Springer), 233-295.

Popov A., D. Chobanov 2004. Dermaptera, Mantodea, Blattodea, Isoptera and Orthoptera of the Eastern Rhodopes (Bulgaria and Greece). – In: Beron P., A. Popov (eds.): Biodiversity of Bulgaria. 2. Biodiversity of Eastern Rhodopes (Bulgaria and Greece). Sofia (Pensoft, National Museum of Natural History, Sofia), 241-309.

Popov, V., C. Deltshev, G. Blagoev, I. Krusteva, D. Deltshev 2000. - Epigeobiont animal assemblages from two landscapes of the Bulgarian Black Sea coast: Relationship to habitat type, assemblage structure and biodiversity. II. Spiders (Araneae). Acta zool. bulg. 52: 51-88.

Puton A. 1888. Hémiptères nouveaux ou peu connus et notes diverses. – Revue d’Entomologie, 7: 103-110.

Putshkov V.G. 1961. Shield-bugs. – In: Markevich O.P. (ed.): Fauna of Ukraine, Volume 21. No. 1. Kiev (Publishing House of the Academy of Sciences of the URSR), 338 p. (In Ukrainian).

Rambousek F. 1912. Fauna coleopterorum bulgarica. – Travaux de la Société bulgare des sciences naturelles, 5: 57-113. (In Bulgarian).

Russev B. 1957. Beitrag zur Kenntnis der Eintagsfliegen (Ephemeroptera) Bulgariens. – Bulletin de l’Institut zoologique de l’Académie des sciences de Bulgarie, 6: 553-568. (In Bulgarian).

Russev B. 1959a. “Vol de compensation pour la ponte” de Palingenia longicauda Oliv. (Ephem.) contre le courant du Danube. – Comptes rendus de Académie bulgare des Sciences, 12(2): 165-168.

Russev B. 1959b. Beitrag zur Erforschung des Makrobenthos der Donau am bulgarischen Ufer. – Comptes rendus de l’Académie bulgare des Sciences, 12(4): 345-348.

Russev B. 1960. Neue Eintagsfliegen für die Fauna Bulgariens (Ephemeroptera). – Beiträge zur Entomologie, 10(7/8): 697-705.

Russev B. 1966. Hydrobiologische Untersuchungen der Marica. I. – In: Die Fauna Thrakiens. Sammelwerk. Band III. Sofia (Verlag der Bulgarischen Akademie der Wissenschaften), 231-291. (In Bulgarian).

Russev B. 1968. Ökologische Untersuchungen über die Ephemeropterenlarven der Donau vor dem bulgarischen Ufer. – In: Valkanov A., B. Russev, W. Naidenow (еds.): Limnologische Berichte der X. Jubiläumstagung Donauforschung. Sofia (Verlag der Bulgarischen Akademie der Wissenschaften), 295-303.

Russev B. 1971. New representatives of Ephemeroptera and Plecoptera (Insecta) for the fauna of Bulgaria. – Bulletin de l’Institut de zoologie et musée, 33: 111-114. (In Bulgarian).

Russev B. 1977. Einfluss der Corioliskraft auf die Breitenverteilung der Bodenablagerungen und der zugehörigen Biozönosen im bulgarischen Donauabschnitt. – Archiv für Hydrobiologie, Suppl. 52 (Donauforschung 6) (1): 23-31.

Russev B. 1987. Ecology, life history and distribution of Palingenia longicauda (Olivier) (Ephemeroptera). – Tijdschrift voor Entomologie, 130: 109-127.

Russev B., I. Janeva, M. Čankova 1991. Distribution and ecology of the larvae from order Ephemeroptera (Insecta) in the Bulgarian Black Sea tributaries. – Hydrobiology (Sofia), 36: 56-67. (In Bulgarian).

Russev B., I. Janeva, R. Detcheva, M. Karapetkova 1994. Hydrobiologie. – In: Russev B. (ed.): Limnologie der bulgarischen Donauzuflüsse. Sofia (Paper Tiger), 130-233. (In Bulgarian).

Russev B., M. Nikolova, M. Dimitrova 1984. Hydrobiological and saprobiological alterations in the Tunja River. I. 1955-1967. – Hydrobiology (Sofia), 22: 59-73. (In Bulgarian).

Russev B., J. Uzunov 1991a. Der Zustand der benthalen Zoozönosen im bulgarisch-rumänischen Donauabschnitt (Oktober 1986). – Hydrobiology (Sofia), 37: 24-33.

Russev B., J. Uzunov 1991b. Zoobenthos und saprobiologischer Zustand der Donau während der im März 1988 durchgeführten internationalen Expedition. – Hydrobiology (Sofia), 37: 34-40.

Russev B., Y. Vidinova 1994. Verbreitung und Ökologie der Vertreter einiger Familien der Ordnung Ephemeroptera (Insecta) in Bulgarien. – Lauterbornia, 19: 107-113.

Scheffler W. 1973. Libellen (Odonata) aus Bulgarien. Deutsche entomologische Zeitschrift, 20(4/5): 357-362.

Schleuter A., M. Schleuter, T. Tittizer 1989. Beitrag zur Autökologie von Ephoron virgo (Olivier). – Spixiana, 12(2): 135-144.

Schoenemund E. 1929. Beiträge zur Kenntniss der Nymphe von Palingenia longicauda Oliv. – Zoologischer Anzeiger, 80: 106-120.

Sladeček V. 1973. System of water quality from the biological point of view. –Archiv für Hydrobiologie, 7: 1-218.

Soldán T. 1982. A redescription of Ephemerella maculocaudata Ikonomov with notes on Balkan species of the genus Ephemerella (Ephemeroptera, Ephemerellidae). – Acta zoologica bulgarica, 20: 44-50.

Soldán T. 1986. A revision of the Caenidae with ocellar tubercles in the nymphal stage (Ephemeroptera). - Acta Universitatis Carolinae, Biologica, 1982-1984: 289-362.

Soldán T. 1992. Jepice – Ephemeroptera. In: Škapec L. (ed.): Red book of endangered and rare species of plants and animals of Czechoslovakia. Bratislava (Priroda), 60-62.

Sowa R. 1975. Ecology and biogeography of mayflies (Ephemeroptera) of running waters in the Polish part of the Carpathians. 2. Life Cycles. – Acta Hydrobiologica, 17: 319-353.

Staręga W. 1976. Die Weberknechte (Opiliones, excl. Sironidae) Bulgariens. – Annales zoologici, Warszawa, 33(18): 287-433.

Sternberg K., R. Buchwald 2000. Die Libellen Baden-Württembergs. Band 2: Grosslibellen (Anisoptera). Stuttgart (Verlag Eugen Ulmer). 712 p.

Stoev P. 2001. A synopsis of Bulgarian cave centipedes (Chilopoda). – Arthropoda Selecta, 10 (1): 31-54.

Stoev P., H. Enghoff 2003. Systematics, phylogeny and biogeography of genus Balkanopetalum Verhoeff, 1926 (Diplopoda: Callipodida: Schizopetalidae). – Zootaxa,272: 1-26.

Strasser K. 1969. Über Diplopoden Bulgariens, II. – Annales Zoologici (Warszawa), 27(7): 133-168.

Strasser K. 1973. Über Diplopoden Bulgariens, III. - Annales Zoologici (Warszawa), 30(15): 411-469.

Strenger A. 1973. Die Mandibelgestalt der Ephemeridenlarven als funktionsmorphologisches Problem. – Verhandlungsberichte der Deutschen Zoologischen Gesellschaft, 66: 75-79.

Tabacaru I. 1967. Beiträge zur Kenntnis der cavernicolen Antroleucosomiden (Diplopoda, Ascospermophora). – International Journal of Speleology, 3: 1-31.

Tschorbadschiew P. 1915. Beitrag zur Macro- und Microlepidopterenfauna der Umgebung von Burgas. – Sbornik na Balgarskata akademiya na naukite, 5: 1-78. (In Bulgarian).

Turin H., L. Penev, A. Casale (eds.) 2003. The Genus Carabus in Europe. A Syntesis. Sofia – Moscow (Pensoft Publishers) & Leiden (European Invertebrate Survey). xvi + 512 p.

Unger E. 1927. Magyar tavak és folyók természetes haltápláléka. – Kisérletügyi közlemenyek, 30: 559-569.

Urbanski J. 1972 Bemerkungen zur Kenntnis balkanischer Alopiinae (Moll., Pulm.) (Systematische, zoogeographische und ökologische Studien über die Mollusken der Balkan-Halbinsel. XI.) Bull.Soc.Amis.Sci.Lett.Poznan 12-13 (D): 251-260,

Uzunov J., B. Russev, S. Kovachev, I. Yaneva 1981. Species composition and distribution of the macrozoobenthos of the Maritsa River. – Hydrobiology (Sofia), 14: 3-15. (In Bulgarian).

Verhoeff K. 1937. Über Diplopoden aus Bulgarien, gesammelt von Dr. I. Buresch und seinen Mitarbeitern. IV. Aufsatz. – Mitteilungen aus den Königlichen naturwissenschaftlichen Instituten in Sofia – Bulgarien, 10: 93-120.

Vidinova Y., B. Russev 1997. Distribution and ecology of the representatives of some Ephemeropteran families in Bulgaria. – In: Landolt P., M. Sartori (ed.): Ephemeroptera & Plecoptera: Biology – Ecology – Systematics. Fribourg (MTL), 139-146.

Vidinova Y., I. Yaneva, V. Tyufekchieva 2006. Ephemeroptera and Plecoptera (Insecta) from the Bulgarian part of the Struma River. – Acta zoologica bulgarica, 58(1): 125-130.

Weissmair W. 1994. Eidonomie und Ökologie zweier europäischer Schwammfliegen-Arten (Neuroptera: Sisyridae). – Entomologia Generalis, 18(3/4): 261-272.

Wildermuth H., Y. Gonseth, A. Maibach (Herausg.) 2005. Odonata. Die Libellen der Schweiz. – In: Fauna Helvetica. 12. Neuchâtel (CSCF/SEG). 398 p.