1. N. F. Mott, E. A. Davis, Electronic Processes in Noncrystalline Materials( Clarendon, Oxford, 1979 ).
2. N. F. Mott, Metal-Insulator Transitions (Taylor & Francis, London,1974)
3. N. F. Mott, Proc. Phys. Soc. (London) A 62, 416 (1949).
4. N. F. Mott, Philos. Mag. 13, 989 (1966), 26, 505 (1972); ref. 2, p.228.
5. For recent reviews, see F. Yonezawa, T. Ogawa, Progr. Theor. Phys. (Japan) Suppl. 72, 1 (1982); H. Endo, ibid., 100.