1. D. ter Haar: Collected Papers of L. D. Landau (Pergamon Press, London, 1965), p. 163.
2. V. I. Kogan, in Plasma Physics and the Problem of Controlled Thermonuclear Reactions, edited by M. A. Leontovich (Pergamon Press, New York, 1961), Vol. I, p. 153 [Kogan's work done in 1951 (in Russian)].
3. On the relaxation of anisotropic plasmas
4. L. Spitzer, Jr. Physics of Fully Ionized Gases (Interscience Publishers, Inc., New York, 1956), p. 76.
5. Temperature Relaxation in a Fully Ionized Plasma