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Tomasello M, Savage-Rumbaugh S, & Kruger AC. (1993). Imitative learning of actions on objects by children, chimpanzees, and enculturated chimpanzees. Child Dev., 64, 1688.
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Lieberman, D. (1993).
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Parelli, P. (1993).
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de Waal, F. B. M. (1993). Animal Social Conflict.
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(1993). Wolves in Europe: status and perspectives. Ettal, Germany: Munich Wildlife Society.
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