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Mendl M, H. Z. Living in gourps: Evolutionary Perspective. In Social Behavior in Farm Animals.
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HAFEZ, E. S. E., WILLIAMS, M., & WIERZBOWSKI, S. (1962). The Behaviour of Horses..
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Breummer, F. (1967). The wild horses of Sable Island. Animals, 10, 14–17.
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Bannikov, A. G. (1971). The Asiatic Wild Ass: neglected relative of the horse. Animals, 13, 580–585.
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Epstein H,. (1971). Wild horses – Recent and extinct. In In: The origin of the domestic animals of Africa II (pp. 401–417).
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Bökönyi, S. (1984). Horse. In Manson (Ed.), Evolution of domesticated animals (Vol. 18, pp. 162–173). Hoboken, NJ: John Wiley & Sons.
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Epstein H,. (1984). Ass, mule and onager. In In Manson: Evolution of domesticatd animals. (pp. 174–184).
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Siegel, H. S. (1987). Effects of behavioural and physical stressors on immune responses. London: Martinus Nijhoff.
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de Waal, F. B. M. (1992). Coalitions as part of reciprocal relations in the Arnhem chimpanzee colony. In A. H. Harcourt, & F. B. M. de Waal (Eds.), Coalitions and Alliances in Humans and Other Animals (pp. 233–257). Oxford: Oxford University Press.
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Ehardt, C. L., & Bernstein, I. S. (1992). Conflict intervention behaviour by adult male macaques: structural and functional aspects. In A. H. Harcourt, & F. B. M. de Waal (Eds.), Coalitions and Alliances in Humans and Other Animals (pp. 83–111). Oxford: Oxford University Press.
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