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Inoue-Nakamura N, & Matsuzawa T. (1997). Development of stone tool use by wild chimpanzees (Pan troglodytes). J. Comp. Psychol., 111, 159.
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Sakura O, & Matsuzawa T. (1991). Flexibility of wild chimpanzees nut-cracking behavior using stone hammers and anvils: an experimental analysis. Ethology, 87, 237.
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