1. L.P. Kadanoff, G. Baym, Quantum Statistical Mechanics: Green’s Function Methods in Equilibrium and Nonequilibrium Problems (W.A. Benjamin Inc, New York, 1962)
2. H. Stolz, Einführung in die Vielelektronentheorie der Kristalle (Akademie-Verlag, Berlin, 1974)
3. H.B. Callen, R.T. Welton, Irreversibility and generalized noise. Phys. Rev. B 83, 34–40 (1951)
4. R. Kubo, The fluctuation-dissipation theorem. Rep. Prog. Phys. 29, 255–284 (1966)
5. A.A. Abrikosov, L.P. Gorkov, I.E. Dzyaloshinski, Methods of Quantum Field Theory in Statistical Physics (Prentice-Hall Inc, Englewood Cliffs, 1963)