1. Y. L. Klimontovich,The Statistical Theory of Nonequilibrium Processes in a Plasma(M. I. T., Cambridge, Massachusetts, 1967), Chap. 1, pp. 10–38.
2. W. P. Allis, S. J. Buchsbaum, and A. Bers,Waves in Anisotropic Plasmas(M. I. T., Cambridge, Massachusetts, 1963), Chap. 8, pp. 126–131.
3. T. H. Stix,The Theory of Plasma Waves(McGraw-Hill, New York, 1962), Chap. 3, pp. 46–52.
4. A. Bers, inPlasma Physics-Les Houches 1972(Gordon and Breach, New York, 1975), pp. 126–134.