1. A. A. Bugaev, B. P. Zakharchenya, and F. A. Chudnovskii, The Metal-Insulator Transition and its Applications [in Russian], Nauka, Leningrad (1979), 183 pp.
2. G. V. Loseva, G. M. Abramova, and S. G. Ovchinnikov, Fiz. Tverd. Tela (Leningrad) 25, 3165 (1983) [Sov. Phys. Solid State 25, 1824 (1983)]; G. V. Loseva, G. M. Mukoed, and S. G. Ovchinnikov, IFSO Preprint (Krasnoyarsk, 1987).
3. G. V. Loseva, L. I. Ryabinkina, S. S. Aplesnin, A. D. Balaev, A. M. Vorotynov, A. F. Bovina, and K. I. Yanushkevich, Fiz. Tverd. Tela (St. Petersburg) 39, 1428 (1997) [Phys. Solid State 39, 1267 (1997)].
4. Yu. V. Kopaev, Trudy FIAN 86, 3 (1975).
5. I. Kawada, M. Nakano-Onoda, M. Ishii, M. Saeki, and M. Nakahira, J. Solid State Chem. 15, 246 (1975).