1. Nicolet, M., in Physics of the Upper Atmosphere (edit. by Ratcliffe, J. A.), Ch. 2 (Academic Press, 1960).
2. Shimizu, M., Inst. Space and Aeronaut. Sci., Univ. of Tokyo, Rept. No. 455 (1970).
3. Tsederberg, N. V., Thermal Conductivities of Gases and Liquids (MIT Press, 1965).
4. Dalgarno, A., and Smith, F. J., Planet. Space Sci., 9, 1 (1962).
5. Dalgarno, A., and Smith, F. J., Proc. Roy. Soc, A, 267, 417 (1962).