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Werth E,. (1929). Zur Abstammung des Hausesels. Sitzungsber Ges Naturforsch Freunde, , 1–3, 342–355.
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Williams M,. (1956). Horse Psychology. London.
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Willoughby Dp,. (1974). The empire of Equus.
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Winkler A,. (1992). The feeding ecology of the Cape Mountain zebra in the Mountain Zebra National Park. Doctoral thesis, , .
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Wolfe Ml,. (1979). Feral horse demography: A preliminary report (Abstract).
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Wolfe Ml,. (1979). Population ecology of the kulan.
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Woodward Sl,. (1979). Population dynamics of a herd of feral burros (Abstract).
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Würbel,. Mating Stategies of male donkeys in a promiscuous mating system Diss Bern. Doctoral thesis, , Bern.
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Würbel, H. (1990). The relationship between social structure and mating system in donkeys & Mating strategies of male donkeys in a promiscuous mating system"l structure and mating system in donkeys &. Diploma thesis, , Faculty of Natural Sciences, University of Berne, Switzerland.
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Zebegmid D,. (1959). Erhaltung seltener Tiere in der Welt. siehe Bannikov.
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