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Heraclitus : Ephesius
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Gentile, Giovanni <1875-1944>
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Aristoteles
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Freinet, Célestin
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Sorel, Georges
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Aporti, Ferrante <1791-1858>
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Labriola, Antonio <1843-1904>
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Gabelli, Aristide
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Schopenhauer, Arthur
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Washburne, Carleton W.
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Kant, Immanuel
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Diringer, David
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Peretti, Aurelio
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Casella, Mario <1886-1956>
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Bigongiari, Piero
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Nocentini, Lodovico
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Severini, Antelmo
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