1. V. L. Ginzburg and I. M. Frank, Zh. Éksp. Teor. Fiz. 16, 15 (1946).
2. I. E. Tamm, J. Phys. (Moscow) 1, 439 (1939).
3. L. D. Gol’dshtein and N. V. Zernov, Electromagnetic Fields and Waves, 2nd ed. (Sovetskoe Radio, Moscow, 1971) [in Russian].
4. E. M. Purcell, Electricity and Magnetism, 2nd ed. (McGraw-Hill, New York, 1985; Nauka, Moscow, 1983).
5. B. M. Bolotovskiĭ, Tr. Fiz. Inst. im. P. N. Lebedeva, Akad. Nauk SSSR 140, 95 (1982).