1. S. Chapman and T. G. Cowling, Mathematical Theory of Non‐uniform Gases (Cambridge University Press, Cambridge, England, 1952), 2nd ed.
2. J. O. Hirschfelder, C. F. Curtiss, and R. B. Bird, Molecular Theory of Gases and Liquids (John Wiley & Sons, Inc., New York, 1954; second printing, 1964).
3. (a) N. N. Bogolubov, Problems of a Dynamical Theory in Statistical Physics (Moscow, 1964)
4. [English transl.: M. Gora, in Studies in Statistical Mechanics, J. de Boer and G. E. Uhlenbeck, Eds. (North‐Holland Publ. Co., Amsterdam, 1962), Vol. 1];
5. (b) J. Yvon, Actualities Scientifiques et Industrielles (Herman, Paris, 1935);