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Jerome S. Bruner, Rose R. Olver, Development of Equivalence Transformations in Children, Monographs of the Society for Research in Child Development, Vol. 28, No. 2, Basic Cognitive Processes in Children: Report of the Second Conference Sponsored by the Committee on Intellective Processes Research of the Social Science Research Council (1963), pp. 125-143
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Bruner et al. (1963) studied this question.
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