1. P. N. Baranskii, I. V. Dakhovskii, V. V. Kolomoets, and A. V. Fedosov, Fiz. Tekh. Poluprovodn.,10, 1480 (1976).
2. P. N. Baranskii, I. V. Dakhovskii, V. V. Kolomoets, and A. V. Fedosov, Fiz. Tekh. Poluprovodn.,10, 1387 (1976).
3. V. V. Kolomoets, A. V. Fedosov, and V. P. Shapovalov, Fiz. Tekh. Poluprovodn.,10, 1390 (1976).
4. K. Hess, J. Phys. Chem. Solids,33, 139 (1972).
5. G. L. Bir, A. N. Blum, and Yu. V. Ilisavskii, Phys. Semicond., Paris (1964), p. 529.