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  Author Title Year Publication Serial Volume Pages Links
Heinrich, B.; Bugnyar, T. Just how smart are ravens? 2007 Scientific American 4101 296 64-71 details   openurl
Rumbaugh, D.M.; Riesen, A.H.; Wright, S.C. Creative responsiveness to objects: a report of a pilot study with young apes 1972 Folia Primatologica; International Journal of Primatology 4183 17 397-403 details   openurl
Neuringer, A. Reinforced variability in animals and people: implications for adaptive action 2004 The American Psychologist 4106 59 891-906 details   doi
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