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Author (up) Title Year Publication Serial Volume Pages
Paukner, A.; Anderson, J.R.; Fujita, K. Redundant food searches by capuchin monkeys (Cebus apella): a failure of metacognition? 2006 Animal cognition 15 9 110-117
Pepperberg, I.M. Grey parrot numerical competence: a review 2006 Animal Cognition 2448 9 377-391
Pepperberg, I.M.; Brezinsky, M.V. Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size 1991 Journal of Comparative Psychology 3610 105 286-294
Rilling, M.E.; Neiworth, J.J. How animals use images 1991 Science Progress 2831 75 439-452
Zentall, T.R.; Galizio, M.; Critchfied, T.S. Categorization, concept learning, and behavior analysis: an introduction 2002 Journal of the experimental analysis of behavior 236 78 237-248