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9Flavell J H. Perspectives on perspective taking. In: H Beilin, P B Pufall (eds.) Piaget's theory prospects and possibilities. Lawrence Erlbaum Associates, 1992: 107-139.
10Leeper R. A study of a neglected portion of the field of learning the development of sensory organization. Journal of Genetic Psychology. 1935, 46: 61- 73.