1. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics. Vol. 8. Electrodynamics of Continuous Media (Nauka, Moscow, 1982; Pergamon Press, New York, 1984).
2. A. V. Dugin, B. Ya. Zel’dovich, N. D. Kundikova, and V. S. Liberman, Pis’ma Zh. Éksp. Teor. Fiz. 53, 186 (1991) [JETP Lett. 53, 197 (1991)].
3. A. V. Dugin, B. Ya. Zel’dovich, N. D. Kundikova, and V. S. Liberman, Zh. Éksp. Teor. Fiz. 100, 1474 (1991) [Sov. Phys. JETP 73, 816 (1991)].
4. N. R. Sadykov, Kvantovaya Élektron. (Moscow) 19, 1021 (1992).
5. N. R. Sadykov, Kvantovaya Élektron. (Moscow) 20, 1140 (1993).