1. L. D. Landau and E. M. Lifshitz, Electrodynamics ofContinuous Media(Pergamon, New York, 1975), p. 256.
2. Y. L. Klimontovich,The Statistical Theory of Nonequilibrium Processes in a Plasma(MIT Press, Cambridge, Mass., 1967), Secs. 14 and 15.
3. S. Ichimaru,Basic Principles of Plasma Physics(Banjamin, Reading, Mass., 1973).
4. Longitudinal plasma oscillations
5. On Landau Damping