1. J. F. Waymounth andF. Bitter:Phys. Rev.,95, 941 (1954).
2. V. M. Fridkin, A. N. Bogatyrev andE. V. Brakhman:Sov. Phys. Solid State,2, 1952 (1961).
3. B. M. Golovin, N. T. Kashukeev, I. N. Orlov andV. M. Fridkin:Sov. Phys. Solid State,2 911 (1960).
4. See for example:H. F. Ivey:Electroluminescence and Related Effects (New York, 1963).
5. A. G. Fischer:Journ. Electrochem. Soc.,109, 1043 (1962).