1. B. S. Kerner and V. V. Osipov, Zh. Éksp. Teor. Fiz. 71, 1542 (1976) [Sov. Phys. JETP 44, 807 (1976)].
2. B. S. Kerner and V. V. Osipov, Fiz. Tverd. Tela 21, 2342 (1979) [Sov. Phys. Solid State 21, 1348 (1979)].
3. V. V. Gafiichuk, B. S. Kerner, V. V. Osipov, and I. V. Tys-lyuk, Fiz. Tverd. Tela 31, 46 (1989) [Sov. Phys. Solid State 31, 25(1989)].
4. B. S. Kerner and V. V. Osipov, Fiz. Tekh. Poluprovodn. 13, 891 (1979) [Sov. Phys. Semicond. 13, 523 (1979)].
5. V. V. Gafiichuk, B. S. Kerner, V. V. Osipov, and A. G. Yuzhanin, Fiz. Tekh. Poluprovodn. 22, 2051 (1988) [Sov. Phys. Semicond. 22, 1298 (1988)].