1. A model for collision processes in gases;BHATNAGAR;I. Phys. Rev,1954
2. Dynamics of rarefied gases;KROOK;Ibid,1955
3. Model for collision processes in gases;GROSS;Ibid,1956
4. Thermal diffusion in ionized gases;CHAPMAN;Proc. Phys. Soc. London,1958
5. S. CHAPMAN and T. G. COWLING, “The Mathematical Theory of Nonuniform Gases.” Cambridge Univ. Press, Cambridge, England, 1939; with “Notes added in 1951,” referred to on pp. 9,22,43,44, 81, 84, 94, 95, 97, 98,100,104,194,244.