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2. S Ichimaru, Basic principles of plasma physics, A statistical approach (Benjamin, New York, 1973) p. 77
3. R J Goldston and P H Rutherford, Introduction to plasma physics (Institute of Physics Publishing, Bristol, 1995) p. 363
4. A Hasegawa, Plasma instabilities and nonlinear effects (Springer, New York, 1975) p. 34
5. R C Davidson, Methods in nonlinear plasma theory (Academic, New York, 1972) p. 15