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3. Th.H. Stix: Waves in Plasmas (American Institute of Physics, New York 1992)
4. L. Brillouin: Wave Propagation and Group Velocity (Academic Press, New York 1960)
5. I.P. Shkarofsky, T.W. Johnston, M.P. Bachynski: The Partic1e Kinetics oE Plasmas (Addison-Wesley, London 1966)