1. R. C. Davidson, Methods in Nonlinear Plasma Theory (Academic, New York, 1972).
2. A. I. Akhiezer and R. V. Polovin, Sov. Phys. JETP 3, 696 (1956).
3. J. M. Dawson, Phys. Rev. 113, 383 (1959).
4. G. Lehmann, E. W. Laedke, and K. H. Spatschek, Phys. Plasmas 14, 103109 (2007).
5. Ya. B. Zel’dovich and A. D. Myshkis, Elements of Mathematical Physics (Nauka, Moscow, 1973) [in Russian].