1. L. G. Wang and M. Reiser, Phys. Plasmas 5, 2064 (1998).
2. K. Tian, Y. Zou, Y. Cui, et al., Phys. Rev. ST-AB 9, 014201 (2006).
3. J. D. Lawson, The Physics of Charged-Particle Beams (Clarendon, Oxford, 1977; Mir, Moscow, 1980).
4. M. I. Rabinovich and D. I. Trubetskov, Oscillations and Waves in Linear and Nonlinear Systems (Nauka, Moscow, 1984; Kuwer, Dordrecht, 1989).
5. N. M. Ryskin and D. I. Trubetskov, Radiotekh. Élektron. 38, 193 (1993).