1. V. A. Zhdanov, V. V. Polyakov, and V. F. Konusov, Fiz. Tverd. Tela,15, 3439 (1973).
2. V. A. Zhdanov and V. V. Polyakov, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 1, 134 (1974).
3. V. A. Zhdanov, V. V. Polyakov, and V. F. Konusov, Teor. Eksp. Khim.,10, 276 (1974).
4. D. A. Kirzhnits Tr. FIAN,16, 3 (1961).
5. V. A. Zhdanov and V. F. Konusov, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 3, 151 (1964).