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  1. The descent of man, and selection in relation to sex.Charles Darwin - 1898 - New York: Plume. Edited by Carl Zimmer.
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  • The basis of solution by chimpanzees of the intermediate size problem.K. W. Spence - 1942 - Journal of Experimental Psychology 31 (4):257.
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  • A study of the continuity of the problem-solving process.I. Krechevsky - 1938 - Psychological Review 45 (2):107-133.
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  • Principles of Behavior. An Introduction to Behavior Theory. [REVIEW]E. N. - 1943 - Journal of Philosophy 40 (20):558-559.
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  • The formation of learning sets.Harry F. Harlow - 1949 - Psychological Review 56 (1):51-65.
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  • Animal Intelligence.George John Romanes - 1882
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  • On the evolution of mind.Harry J. Jerison - 1985 - In David A. Oakley (ed.), Brain and Mind. Methuen. pp. 1--31.
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