1. V. L. Ginzburg and A. A. Rukhadze, Electromagnetic Waves in Plasmas (Nauka, Moscow, 1970) [in Russian].
2. A. B. Shvartsburg, Usp. Fiz. Nauk 170(12), 1297 (2000).
3. B. A. Lagovskiĭ, Radiotekh. i Élektron. 51(1), 74 (2006).
4. N. S. Erokhin, L. A. Mikhaĭlovskaya, and N. N. Erokhin, Preprint of Space Research Inst., Russian Academy of Sciences, no. Pr-2109, Moscow, 2005.
5. S. V. Nazarenko, A. C. Newell, and V. E. Zakharov, Phys. Plasmas 1, 2827 (1994).