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Author (up) Title Year Publication Serial Volume Pages
Hayashi, M.; Matsuzawa, T. Cognitive development in object manipulation by infant chimpanzees 2003 Animal Cognition 2559 6 225-233
Hirata, S.; Celli, M.L. Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees 2003 Animal Cognition 2555 6 235-244
Sousa, C.; Okamoto, S.; Matsuzawa, T. Behavioural development in a matching-to-sample task and token use by an infant chimpanzee reared by his mother 2003 Animal Cognition 2556 6 259-267