1. J. R. Clow and J. D. Reppy,Phys. Rev. Lett. 16:887?889 (1966).
2. P. A. M. Dirac,The Principles of Quantum Mechanics, 3rd ed. (Oxford University Press, London, 1948).
3. A. Einstein, Quantentheorie des einigatomigen idealen Gases,Sitzungsber. Preuss. Akad. Wiss. Berl. Phys.-Math. Kl. 22:261?267 (1924); [reprinted in R. C. Majumdar,Bosons (Hindustan Publishing, Delhi, 1964)].
4. M. Fannes, H. Spohn, and A. Verbeure, Equilibrium states for mean-field models,J. Math. Phys. 21:355?358 (1980).
5. W. Feller,An Introduction to Probability Theory and Its Applications, Vol. 1, pp. 50?52 (Wiley, New York, 1957).