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  1. The Child's Conception of Space.Jean Piaget, Baerbel Inhelder, F. J. Langdon & J. L. Lunzer - 1957 - British Journal of Educational Studies 5 (2):187-189.
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  • The perspective illusion: Perceived size and distance in fields varying in suggested depth, in children and adults.Joachim F. Wohlwill - 1962 - Journal of Experimental Psychology 64 (3):300.
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  • Cross-linguistic regularities in the frequency of number words.S. Dehaene - 1992 - Cognition 43 (1):1-29.
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