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Mill, John Stuart
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Piaget, Jean
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Piaget, Jean
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Piaget, Jean
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Piaget, Jean
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Gerard, Robert
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Leibniz, Gottfried Wilhelm
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Piaget, Jean
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Leibniz, Gottfried Wilhelm
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Höffding, Harald
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Mill, John Stuart
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Delvolvé, Jean
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Regnaud, Paul
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Oldenberg, Hermann
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Höffding, Harald
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Segond, Joseph
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Freud, Sigmund
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Kant, Immanuel
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Taine, Hippolyte-Adolphe
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Piaget, Jean
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Lubbock, John <1834-1913>
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Leibniz, Gottfried Wilhelm
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Inhelder, Bärbel
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James, William <1842-1910>
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