1. O. G. Grushka, Z. M. Grushka, V. M. Frasunyak, and V. S. Gerasimenko, Fiz. Tekh. Poluprovodn. (St. Petersburg) 33, 1416 (1999) [Semiconductors 33, 1272 (1999)].
2. O. G. Grushka, P. M. Gorlei, A. V. Bestsennyi, and Z. M. Grushka, Fiz. Tekh. Poluprovodn. (St. Petersburg) 34, 1197 (2000) [Semiconductors 34, 1147 (2000)].
3. G. G. Grushka, A. P. Bakhtinov, and Z. M. Grushka, J. Adv. Mater. 4(1), 36 (1997).
4. Physics and Materials Technology of Semiconductors with Deep Levels, Ed. by V. I. Fistul’ (Metallurgiya, Moscow, 1987).
5. B. I. Shklovskii and A. L. Éfros, Electronic Properties of Doped Semiconductors (Nauka, Moscow, 1979; Springer, New York, 1984).