1. V. L. Vinetskii, N. I. Kashirina, and É. A. Pashitskii, Ukr. Fiz. Zh. 37(1), 77 (1992).
2. S. G. Suprun and B. Ya. Moizhes, Fiz. Tverd. Tela (Leningrad) 24(5), 1571 (1982) [Sov. Phys. Solid State 24, 903 (1982)].
3. S. I. Pekar, Investigations on Electron Theory of Crystals (Gostekhizdat, Moscow, 1951).
4. V. L. Vinetskii and M. Sh. Gitterman, Zh. Éksp. Teor. Fiz. 33(3), 730 (1957) [Sov. Phys. JETP 6, 560 (1958)].
5. V. L. Vinetskii, O. Meredov, and V. A. Yanchuk, Teor. Éksp. Khim. 25(6), 641 (1989).