1. N. F. Kovalev and M. I. Fuks, Preprint No. 13 (Institute of Applied Physics, Gorki, 1980).
2. N. F. Kovalev, Zh. Tekh. Fiz. 72(7), 113 (2002) [Tech. Phys. 47, 906 (2002)].
3. A. E. Dubinov and I. E. Efimova, Zh. Tekh. Fiz. 71(6), 80 (2001) [Tech. Phys. 46, 723 (2001)].
4. A. M. Ignatov and V. P. Tarakanov, Phys. Plasmas 1, 741 (1994).
5. S. Ya. Belomyttsev, A. A. Grishkov, S. D. Korovin, and V. V. Ryzhov, Pis’ma Zh. Tekh. Fiz. 29(16), 16 (2003) [Tech. Phys. Lett. 29, 944 (2003)].