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  Author Title Year Publication Serial (up) Volume Pages Links
Vlamings, P.H.J.M.; Uher, J.; Call, J. How the great apes (Pan troglodytes, Pongo pygmaeus, Pan paniscus, and Gorilla gorilla) perform on the reversed contingency task: the effects of food quantity and food visibility 2006 Journal of Experimental Psychology. Animal Behavior Processes 2765 32 60-70 details   doi
Beran, M.J.; Beran, M.M.; Harris, E.H.; Washburn, D.A. Ordinal judgments and summation of nonvisible sets of food items by two chimpanzees and a rhesus macaque 2005 Journal of Experimental Psychology. Animal Behavior Processes 2766 31 351-362 details   doi
Beran, M.J.; Pate, J.L.; Washburn, D.A.; Rumbaugh, D.M. Sequential responding and planning in chimpanzees (Pan troglodytes) and rhesus macaques (Macaca mulatta) 2004 Journal of Experimental Psychology. Animal Behavior Processes 2767 30 203-212 details   doi
Boysen, S.T.; Bernston, G.G.; Hannan, M.B.; Cacioppo, J.T. Quantity-based interference and symbolic representations in chimpanzees (Pan troglodytes) 1996 Journal of Experimental Psychology. Animal Behavior Processes 2781 22 76-86 details   openurl
Boysen, S.T.; Berntson, G.G. Responses to quantity: perceptual versus cognitive mechanisms in chimpanzees (Pan troglodytes) 1995 Journal of Experimental Psychology. Animal Behavior Processes 2783 21 82-86 details   openurl
Rumbaugh, D.M.; Savage-Rumbaugh, S.; Hegel, M.T. Summation in the chimpanzee (Pan troglodytes) 1987 Journal of Experimental Psychology. Animal Behavior Processes 2785 13 107-115 details   openurl
Matsuzawa, T. Use of numbers by a chimpanzee 1985 Nature 2793 315 57-59 details   openurl
McGonigle, B. Can apes learn to count? 1985 Nature 2794 315 16-17 details   openurl
Gallup, G.G.J. Do minds exist in species other than our own? 1985 Neuroscience and Biobehavioral Reviews 2808 9 631-641 details   openurl
Poti, P. Chimpanzees' constructional praxis (Pan paniscus, P. troglodytes) 2005 Primates 2811 46 103-113 details   doi
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