Concrete and Formal Operations in very Bright 6- to 11-Year-Olds
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1975 ◽
Vol 91
(1)
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pp. 133-141
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1984 ◽
Vol 7
(1)
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pp. 77-93
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1993 ◽
Vol 21
(1)
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pp. 21-32
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1998 ◽
Vol 27
(2)
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pp. 185-207
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