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Vlamings, Petra H. J. M., Uher, Jana and Call, Josep (2006) 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. Journal of Experimental Psychology: Animal Behavior Processes, 32 (1). pp. 60-70. ISSN 0097-7403