1. K. N. Ul’yanov and A. A. Filippov, High Temp. 39, 499 (2001).
2. A. V. Zharinov and Yu. A. Kovalenko, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 9, 44 (2001).
3. Yu. E. Kreindel’, Plasma Sources of Electrons (Atomizdat, Moscow, 1977) [in Russian].
4. V. L. Galanskii, V. A. Gruzdev, I. V. Osipov, and N. G. Rempe, Izv. Vyssh. Uchebn. Zaved., Fiz. 35(5), 5 (1992).
5. V. A. Gruzdev, V. G. Zalesski, D. A. Antonovich, and Yu. P. Golubev, Vacuum, No. 77, 399 (2005).