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Author Title Year Publication Serial Volume Pages
Brosnan, S.F.; de Waal, F.B.M. A concept of value during experimental exchange in brown capuchin monkeys, Cebus apella 2004 Folia primatologica; international journal of primatology 170 75 317-330
Neuringer, A. Reinforced variability in animals and people: implications for adaptive action 2004 The American Psychologist 4106 59 891-906