1. R. Kubo, Prog. Theor. Phys. Suppl. 64, 1 (1978).
2. R. Luzzi and L.C. Miranda, Phys. Lett. C (Physics Reports) 43, 423 (1978); (b) M. Voos, R.F. Leheny, and J. Shah, in “Hand-book on Semiconductors”, Vol. 2; T.S. Moss, editor, p. 329 (North Holland, Amsterdam, 1980); (c) C. Klingshirn and H. Haug, Phys. Lett. C (Physics Reports) 70, 315 (1981).
3. E.g. N. Mott, “Metal-Insulator Transitions” (Taylor and Francis, London, 1974).
4. H.B. Callen and T. Welton, Phys. Rev. 82, 34 (1951); R. Kubo, J. Phys. Soc. Japan, 12, 570 (1957).
5. D.N. Zubarev, Usp. Fiz. Nauk. 71, 71 (1960) [Soviet Phys.-Usp. 3, 320 (1960)].