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Bennett Dk,. (1980). Stripes do not a zebra make, Part I: A cladistic analysis of Equus. Syst Zool, 29(2), 272–287.
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Macfadden Bj,. (1976). Cladistic analysis of primitive equids, with notes on other perissodactyls. Syst Zool, 25, 1.14.
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