1. Hartmann H., Chung K.-M., and Baykut G. Jr: to be published
2. Viehland L.A., Mason E., and Whealton J.H.: J. Chem. Phys. 62, 4715 (1975)
3. Hirshfelder J.O., Curtiss C.F., and Bird R.B.: Molecular Theory of Gases and Liquids Wiley, New York, 1964
4. McDaniel E.W., Mason E.A.: The Mobility and Diffusion of Ions in Gases Wiley, New York, 1973
5. Hartmann H., Lebert K.-H., and Wanczek K.-P.: Topics in current chemistry 43, 57 (1973)