1. S. Chapman and T. G. Cowling,The Mathematical Theory of Non-Uniform Gases(Cambridge University Press, New York, 1939).
2. For a detailed description of the Chapman-Enskog and Hilbert solutions to the Boltzmann equation see, H. Grad, inHandbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, 1958), Vol. XII, Sec. 23–25.
3. J. E. McCune, T. F. Morse, and G. Sandri, inThird International Symposium on Rarefied Gas Dynamics, edited by J. Laurmann (Academic Press Inc., New York, 1963), p. 115.