1. J. J. Rasmussen, J. P. Lynov, J. S. Hesthaven, and G. G. Sutyrin, Plasma Phys. Controlled Fusion 36, B193 (1994).
2. W. Horton, B. Hu, J. D. Dong, and P. Zhu, New J. Phys. 5, 14.1 (2003).
3. A. I. Morozov, Introduction to Plasmodynamics (Fizmatlit, Moscow, 2006) [in Russian].
4. A. I. Morozov and S. V. Lebedev, Reviews of Plasma Physics, Ed. by M. A. Leontovich (Atomizdat, Moscow, 1974; Consultants Bureau, New York, 1980), Vol. 8.
5. A. Goncharov, Handbook of Ion Sources, Ed. by B. H. Wolf (CRC, New York, 1995), p. 379.