1. Chapter 4
2. L. Onsager: Phys. Rev. 37, 405 (1931);
3. L. Onsager: Phys. Rev. 38, 2265 (1931)
4. A.C. Smith, J.F. Janak, R.B. Adler: Electronic Conduction in Solids (McGraw-Hill, New York 1967) Sect. 3.5
5. S.R. de Groot: Thermodynamics of Irreversible Processes (North-Holland Amsterdam 1953)