1. D. N. Astrov, N. B. Ermakov, A. S. Borovik-Romanov et al., JETP Lett. 63, 745 (1996).
2. I. Dzyaloshinskii, Solid State Commun. 82, 579 (1992).
3. A. F. Andreev and V. I. Marchenko, Zh. Éksp. Teor. Fiz. 70, 1522 (1976) [Sov. Phys. JETP 43, 794 (1976)].
4. A. F. Andreev and V. I. Marchenko, Usp. Fiz. Nauk 130, 39 (1980) [Sov. Phys. Usp. 23, 21 (1980)].
5. L. D. Landau and E. M. Lifshitz, Electrodynamics of Continuous Media, Pergamon Press, N.Y. [Russian original, Nauka, Moscow, 1982, Sec. 23].