1. VI. The influence of diffusion on the propagation of shock waves
2. S. Chapman and T. G. Cowling,The Mathematical Theory of Non-Uniform Gases(Cambridge University Press, Cambridge, England, 1953), Chaps. 6 and 8.
3. For a proof that the charge density and electric field must vanish at both ends if the shock carries no current, and for remarks about the extended Rankine-Hugoniot conditions when the shock carries a current see Greenberg, Sen, and Trève, Geophysical Research Paper No. 66 (1959), which contains a more detailed account of the present work.
4. N. Minorsky,Introduction to Non-Linear Mechanics(J. W. Edwards, Ann Arbor, Michigan, 1947).