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Zeeb K,. (1963). Equus Caballus – Paarung. E.C. E, 509.
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Zwolinski J,. Termin zapladniania klaczy a plec zrebiat.
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Kroodsma, D. E., & Miller, E. H. (Eds.). (1996). Ecology and evolution of acoustic communication in birds. Ithaca: Cornell University Press.
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Berger, J. (1986). Wild Horses of the Great Basin: Social Competition and Population Size. Chicago: University of Chicago Press.
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Heyes, C., & Galef, B. G. (Eds.). (1996). Social learning in animals: the roots of culture. San Diego, CA: Academic Press, Inc.
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Bökönyi, S. The Przevalsky Horse. Souvenir Press Ltd.
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Bos, H. Body condition scoring in free living Przewalski horses. In The International Symposium of the Przewalski Horse (Vol. 1999). Askania Nova.
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Bouman, I. (1998). The reintroduction of Przewalski horses in the Hustain Nuruu Mountain Forest Steppe Reserve in Mongolia. Mededelingen: Netherlands Commission for International Nature Protection, 32.
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Castley, J. G., & Knight, M. H. (1997). Population status of plains zebra, Equus burchelli, in South African National Parks. Scientific Services, National Parks Board, .
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Clabby, J. (1976). The Natural History of the Horse. New York: Taplinger Publishing Company.
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