1. E. H. Kennard,Kinetic Theory of Gases(McGraw-Hill Book Company, Inc., New York, 1938), p. 164.
2. J. O. Hirschfelder, C. F. Curtiss, and R. B. Bird,Molecular Theory of Gases and Liquids(John Wiley & Sons, Inc., New York, 1954), p. 13.
3. S. Chapman and T. G. Cowling,The Mathematical Theory of Non-Uniform Gases(Cambridge University Press, New York, 1952), p. 235.
4. Reference 1, p. 178;
5. reference 3, p. 104.