1. M. Coopersmith,Phys. Rev. 172:230 (1968).
2. M. Coopersmith,Adv. Chem. Phys. XVII:43 (1970).
3. See, for example, K. Huang,Statistical Mechanics (John Wiley & Sons, Inc., New York, 1965), Chap. 17.
4. D. Lee and C. N. Yang,Phys. Rev. 87:410 (1952).
5. J. D. van der Waals; Ph.D. dissertation, University of Leiden, 1873 (unpublished).