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2. Gibbs JW (1875) (Thermodynamics, Chapter 3. Trans of the Connecticut Acad 108; ibid. Gibbs JW (1978) 343 or Dover Book Series (1961) 55
3. Callen HB (1962) Thermodynamics, 3rd ed, John Wiley & Sons, Inc New York, London
4. Borchard W (1975) Habilitationsschrift, Clausthal
5. Dusek K, Patterson D (1968) J Polymer Sci 6:1209