1. Philos. Mag. B 65, Special Issue (1992).
2. C. J. Adkins, in Metal-Insulator Transitions Revisited, Ed. by P. P. Edwards and C. N. R. Rao (Taylor & Francis, London, 1995); J. Phys.: Condens. Matter 1, 1253 (1989).
3. P. Sheng, Philos. Mag. B 65, 357 (1992).
4. E. Z. Meilikhov, Zh. Éksp. Teor. Fiz. 115, 624 (1999) [JETP 88, 819 (1999)].
5. B. A. Aronzon, A. E. Varfolomeev, D. Yu. Kovalev, et al., Fiz. Tverd. Tela (St. Petersburg) 41, 944 (1999) [Phys. Solid State 41, 857 (1999)].