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Author Title Year (up) Publication Serial Volume Pages
Mulcahy, N.J.; Call, J. How great apes perform on a modified trap-tube task 2006 Animal Cognition 2469 9 193-199
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
Palagi, E. Sharing the motivation to play: the use of signals in adult bonobos 2008 Animal Behaviour. 4316 75 887-896