1. D. W. Oxtoby, Adv. Chem. Phys., in press.
2. D. W. Oxtoby, Adv. Chem. Phys. 40, 1 (1979).
3. R. G. Gordon, Adv. Magn. Reson. 3, 1 (1968).
4. B. J. Berne in Physical Chemistry, An Advanced Treatise, Vol. VIIIB, edited by D. Henderson (Academic Press, New York, 1971).
5. 5.D. A. McQuarrie, Statistical Mechanics (Harper and Row, New York, 1976) chapters 21 and 22.