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Boyd, L. E. (1991). The behaviour of Przewalski's horses and its importance to their management. Appl. Anim. Behav. Sci., 29(1-4), 301–318.
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Boyd, L. E. (1988). Ontogeny of behavior in Przewalski horses. Appl. Anim. Behav. Sci., 21(1-2), 41–69.
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Boyd, L. E., Carbonaro, D. A., & Houpt, K. A. (1988). The 24-hour time budget of Przewalski horses. Appl. Anim. Behav. Sci., 21(1-2), 5–17.
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