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2. The Encyclopedia of Philosophy, P. Edwards, ed., Collier-Macmillan, New York, NY, 1967, vol. 2, pp. 42572-27.
3. Routledge Encyclopedia of Philosophy, E. Craig, ed., Routledge, London, 1997, vol. 3, pp. 147–49.
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5. Regnault V.: Mémoires de l’Académie des Sciences, 26, 1–928, (1862).