1. J D Jackson, Classical electrodynamics, Second ed. (Wiley, New York, 1975) p. 342
2. L D Landau and E M Lifshitz, Statistical physics (Part 1) (Pergamon, Oxford, 1985) p. 241
3. See p. 245 of ref. [2]
4. L D Landau and E M Lifshitz, Physical kinetics (Pergamon, Oxford, 1981) p. 131
5. J A Bittencourt, Fundamentals of plasma physics (Pergamon, Oxford, 1986) p. 286