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  Author Title Year Publication Serial (up) Volume Pages Links
Vonk, J. Gorilla ( Gorilla gorilla gorilla) and orangutan ( Pongo abelii) understanding of first- and second-order relations 2003 Animal Cognition 2578 6 77-86 details   doi
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
Van Schaik, C. Why are some animals so smart? 2006 Scientific American 2830 294 64-71 details   openurl
Galdikas, B.M. Orangutan tool use 1989 Science (New York, N.Y.) 2847 243 152 details   openurl
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