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Blaine G,. (1922). Notes on the zebras and some antelopes of Angola. Proc Zool Soc Lond, 317, 1–8.
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Duerst Ju,. (1922). Das Alter des Pferdes und dessen Bestimmung.
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Fraser Af,. (1922). The behaviour of the horse ? (pp. 264–278). Wallingford, UK: C.A.B. International.
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