1. G. Destriau, J. Chim. Phys., 33: 620 (1936).
2. H. K. Henisch, Electroluminescence, Pergamon Press, Oxford (1962).
3. A. N. Georgobiani, Tr. Fiz. Inst. Akad. Nauk SSSR, 23: 3(1963)
4. Yu. P. Chukova, Tr. Fiz. Inst. Akad. Nauk SSSR, 37: 149 (1966)
5. V. M. Fok, Introduction to the Kinetics of Luminescence of Crystal Phosphors [in Russian], Nauka, Moscow (1964).