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Heinrich, B., & Bugnyar, T. (2007). Just how smart are ravens? Sci Am, 296(4), 64–71.
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Rumbaugh, D. M., Riesen, A. H., & Wright, S. C. (1972). Creative responsiveness to objects: a report of a pilot study with young apes. Folia Primatol (Basel), 17(5), 397–403.
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Neuringer, A. (2004). Reinforced variability in animals and people: implications for adaptive action. Am Psychol, 59(9), 891–906.
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