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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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Cheney DL, & Seyfarth RM. (1990). Attending to behaviour versus attending to knowledge: examining monkeys' attribution of mental states. Anim. Behav., 40, 742.
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Heyes CM, & Dawson GR. (1990). A demonstration of observational learning using a bidirectional control. Q. J. Exp. Psychol., 42, 59.
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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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Visalberghi E. (1990). Tool use in Cebus. Folia Primatol., 54, 146.
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Potter, G. D., & Yeates, B. F. (1990). Behavioral principles of training and management. The Horse, 2nd Edn, , 665–682.
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Cheney, D. L., & Seyfarth, R. M. (1990). How Monkeys See the World.
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Cords, M. (1990). 13th Cong. Int. Primat Soc.
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Tooze, Z. J., Harrington, F. H., & Fentress, J. C. (1990). Individually distinct vocalizations in timber wolves, Canis lupus. Anim Behav, 40.
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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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