1. S. L. Adler, Ann. Phys. 67, 599 (1971).
2. A. I. Akhiezer, I. A. Akhiezer, R. V. Polovin, et al., Plasma Electrodynamics (Nauka, Moscow, 1974; Pergamon, Oxford, 1975).
3. V. B. Berestetskii, E. M. Lifshitz, and L. P. Pitaevskii, Quantum Electrodynamics, 2nd ed. (Fizmatlit, Moscow, 2001; Pergamon, Oxford, 1982).
4. P. Feautrier, Ann. Astrophys. 30, 125 (1967).
5. P. Feautrier, Ann. Astrophys. 31, 257 (1968).