1. J. O. Hirschfelder, C. F. Curtiss and R. B. Bird,Molecular Theory of Gases and Liquids, (John Wiley & sons, New York, 1954), p. 661.
2. The Boltzmann Equation and Its Applications
3. Fokker-Planck Equation for an Inverse-Square Force
4. L. D. Landau, inCollected Papers of L. D. LANDAU, edited by D. Ter Haar (Gordon and Breach, New York, 1965), p. 163.