1. Nosenko, E.A. and Shevchuk, V.N., Izv. Akad. Nauk. Ser. Neorg. Mater., 1988, vol. 24, no. 10, p. 1687.
2. Goldman, M., Pure Appl. Chem., 1985, vol. 57, no. 9, p. 1353.
3. Kostishin, V.G., Letyuk, L.M., and Vedyashkin, E.Yu., USSR Patent 2050654, Byull. Izobret., 1945, no. 35.
4. Zhdan, A.G. and Lushnikov, N.A., Fiz. Tekhn. Poluprovodn., 1979, vol. 13,issue 5, p. 1003.
5. Kostyuk, V.Kh., Kostishin, V.G., and Letyuk, L.M., Ukr. Fiz. Zh., 1988, vol. 33, no. 2, p. 61.