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BERNITSCHKE K et al,. (1965). Chromosome complement: differences between Equus caballus and Equus przewalskii, Poliakoff. Science, 148, 382.
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King Jm,. (1965). A field guide to the reproduction of Grant's Zebra and Grevy's Zebra. E Afr Wildl J, 3, 99–117.
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