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2. L. Onsager, Phys. Rev. 37, 1931, 405; ibidem 38, 1931, 2265
3. S. R. de Groot and P. Mazur, Non-Equilibrium Thermodynamics, North-Holland, Amsterdam, 1962.
4. I. Prigogine, Etude Thermodynamique des Phénomènes irreversibles, Désoer, Liège, 1947
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