1. N. F. Mott, Adv. Phys. 16, 49 (1967).
2. N. F. Mott and E. A. Davis, “Electronic Processes in Non-Crystalline Materials”, Clarendon Press, Oxford, 1971.
3. N. F. Mott. Phil. Mag. 29, 613 (1974).
4. T. Kasuya and A. Yanase, Rev. Mod. Phys. 40, 684 (1968).
5. S. von Molnár and T. Kasuya, in “Proc. 10th Int. Conf. on the Physics of Semiconductors, Cambridge, Mass., 1970”, S. P. Keller, J. C. Hensel and F. Stern, eds., CONF-700801 (U.S. AEC Div. of Tech. Info., Springfield, VA 1970), p. 233; T. Kasuya, ibid, p. 243.