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Heptner Vg,. (1961). Distribution, geographical variability and biology of wild horses on the territory of the USSR. Equus, 1, 28–38.
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Heptner Vg,. (1966). 2. Wildpferd, Tarpan Equus (Equus przewalski Poljakov 1881) In: Die Säugetiere der Sowjetunion. In In: Heptner V G & Naumov N P (ed.) Jena (pp. 858–874).
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