1. A. Campa and E. G. D. Cohen,Phys. Rev. Lett. 61:853 (1988).
2. R. J. Huck and E. A. Johnson,Phys. Rev. Lett. 44:142 (1980).
3. R. J. Huck and E. A. Johnson,Arch. Mech. (Warsaw)32:703 (1980).
4. J. D. Foch and G. W. Ford, inStudies in Statistical Mechanics, Vol. 5, J. de Boer and G. E. Uhlenbeck, eds. (North-Holland, Amsterdam, 1970), p. 101.
5. S. Chapman and T. G. Cowling,Mathematical Theory of Non-Uniform Gases, 3rd ed. (Cambridge University Press, 1970).