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Boesch C, & Boesch H. (1990). Tool use and tool making in wild chimpanzees. Folia Primatol., 54, 86.
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Visalberghi E. (1990). Tool use in Cebus. Folia Primatol., 54, 146.
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Sugiyama Y, Koman J, & Bhoye Show M. (1988). Ant-catching wands of wild chimpanzees at Bossou, Guinea. Folia Primatol., 51, 56.
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