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Muybridge E,. (1899). Animals in Motion. London,: Chapman & Hell.
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Ödberg Fo,. (1969). Bijdrage tot de Studie der Gedragenen van het paard (E. caballus L.).
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Orlov Vn,. (1960). Zahnwurzeln. (pp. 66–69).
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Orlov Vn,. (1968). Veränderungen am Schädel von E. hemionus Pall und zur Frage der Evolution der Pferde.
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Orr Djc,. (1963). Grazing sucession in Ngorongoro Crater. Unveröffentl. Manuskript, .
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Pellegrini Sw,. (1971). Home range, territoriality and movement patterns of wild horses in the Wassuk Range of Western Nevada.
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Penzhorn Bl, N. P. Some behavioural traits of Cape Mountain Zebras and their implications for the management of a small conservation animal. Appl Anim Behav Sci, .
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