1. G. V. Karpov, Fiz. Plazmy 26, 146 (2000) [Plasma Phys. Rep. 26, 133 (2000)].
2. V. V. Vikhrev, V. V. Ivanov, K. N. Koshelev, and Yu. V. Sidel’nikov, Dokl. Akad. Nauk SSSR 282, 1361 (1982) [Sov. Phys. Dokl. 27, 153 (1982)].
3. M. A. Gulin, A. N. Dolgov, O. V. Nikolaev, and A. S. Savelov, Fiz. Plazmy 16, 1015 (1990) [Sov. J. Plasma Phys. 16, 590 (1990)].
4. V. V. Vikhrev, V. V. Ivanov, and K. N. Koshelev, Fiz. Plazmy 8, 1211 (1982) [Sov. J. Plasma Phys. 8, 688 (1982)].
5. A. A. Gorbunov, M. A. Gulin, A. N. Dolgov, et al., Pis’ma Zh. Éksp. Teor. Fiz. 50, 320 (1989) [JETP Lett. 50, 355 (1989)].