1. N. D. Borisenko, F. F. Kodzhespirov, and B. A. Polezhaev, Izv. Vyssh. Uchebn. Zaved., Ser. Fiz., No. 9, 33 (1985).
2. M. F. Bulanyi, A. V. Kovalenko, and B. A. Polezhaev, Neorg. Mater. 39, 285 (2003) [Inorg. Mater. 39, 222 (2003)].
3. N. D. Borisenko, M. F. Bulanyi, F. F. Kodzhespirov, and B. A. Polezhaev, Zh. Prikl. Statist. 52(1), 36 (1990).
4. M. F. Bulanyi, E. A. Kovaleva, and B. A. Polezhaev, Neorg. Mater. 37(2), 153 (2001) [Inorg. Mater. 37, 108 (2001)].
5. H. Henish, Electroluminescence (Pergamon, New York, 1962; Mir, Moscow, 1964), ch. 5.