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Antonius O,. (1933). Bemerkungen über Bastarde und Bastardzucht. Biologica Generalis, 9, 39–47.
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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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In Zentall T.R, G. B. G. (Ed.). Social Learning: Psychological and Biological Perspectives. Lawrence Erlbaum Associates.
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McDonnell, S. M. (Ed.). (2003). The Equid Ethogram: A Practical Field Guide to Horse Behavior. Lexington, Kentucky: Eclipse Press.
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Ginsberg, J. R. (1988). Social organisation and mating strategies of an arid adapted equid: The Grevy`s zebra. Ph.D. thesis, Princeton University, Princeton.
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R Development Core Team. (2010). R: A Language and Environment for Statistical Computing [Computer software]. http://www.R-project.org. Available from http://www.R-project.org
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Wasilewski A. (2003). 'Friendship' in ungulates? – Sociopositive relationships between non-related herd members of the same species. Ph.D. thesis, University of Marburg, Marburg.
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Huebener, E. (2002). Coaxing seat, breathing leg, whispering reins.
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BACK DG et al,. (1974). Observations on the sexual behaviour of nonlactating mares. Amer Vet Med Ass J, 165, 717–720.
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Backhaus D,. (1960). Wie Zebras kämpfen. Kosmos, 56, 8–10.
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