1. A. N. Didenko and V. I. Rashchikov, Fiz. Plazmy 18, 1182 (1992) [Sov. J. Plasma Phys. 18, 616 1992)].
2. V. D. Alyokhin, A. E. Dubinov, V. D. Selemir, et al., IEEE Trans. Plasma Sci. 22, 954 (1994).
3. A. A. Rukhadze, S. D. Stolbetsov, and V. P. Tarakanov, Radiotekh. Élektron. (Moscow) 37, 385 (1992).
4. D. I. Trubetskov and A. E. Hramov, Lectures on Microwave Electronics for Physicists (Fizmatlit, Moscow, 2004), Vol. 2 [in Russian].
5. A. E. Dubinov and V. D. Selemir, Radiotekh. Élektron. (Moscow) 47, 575 (2002).