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Author Title Year Publication Serial Volume Pages
Call, J. Inferences by exclusion in the great apes: the effect of age and species 2006 Animal Cognition 2444 9 393-403
Herrmann, E.; Melis, A.P.; Tomasello, M. Apes' use of iconic cues in the object-choice task 2006 Animal cognition 14 9 118-130
Palagi, E. Sharing the motivation to play: the use of signals in adult bonobos 2008 Animal Behaviour. 4316 75 887-896