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9Published 1976Other Authors: '; “...Inhelder, Bärbel...”
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10Published 1971Other Authors: '; “...Inhelder, Bärbel...”
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11Published 1956Other Authors: '; “...Inhelder, Bärbel...”
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12Published 1958Other Authors: '; “...Inhelder, Bärbel...”
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13Published 1956Other Authors: '; “...Inhelder, Bärbel...”
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15Published 1987Other Authors: '; “...Inhelder, Bärbel...”
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