1. J. D. Jackson, Classical Electrodynamics, Second Edition, John Wiley & Sons, New York (1975).
2. M. I. Ryazanov, Introduction to the Electrodynamics of Condensed Matter [in Russian], Fizmatlit, Moscow (2002).
3. V. M. Grichine, Rad. Phys. Chem., 67, 93 (2003).
4. I. E. Tamm and I. M. Frank, Dokl. Akad. Nauk SSSR, No. 14, 107 (1937).
5. I. E. Tamm, J. Phys. USSR, No. 1, 439 (1939).