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Limongelli L, Boysen ST, & Visalberghi E. (1995). Comprehension of cause-effect relations in a tool-using task by chimpanzees (Pan troglodytes). J. Comp. Psychol., 109, 18.
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Povinelli DJ, Nelson KE, & Boysen ST. (1992). Comprehension of role reversal in chimpanzees: evidence of empathy? Anim. Behav., 43, 633.
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Povinelli DJ, Nelson KE, & Boysen ST. (1990). Inferences about guessing and knowing in chimpanzees (Pan troglodytes). J. Comp. Psychol., 104, 203.
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