1. E. P. Gross,J. Stat. Phys. 21:215 (1979).
2. R. P. Feynman and A. R. Hibbs,Quantum Mechanics and Path Integrals (McGraw-Hill, New York, 1965); R. P. Feynman,Statistical Mechanics (W. A. Benjamin Inc., Reading, Massachusetts, 1972).
3. A. Siegel and T. Burke,J. Math. Phys. 13:1681 (1972);Adv. Chem. Phys. 15:355 (1969).
4. G. H. Hardy, J. E. Littlewood, and G. Polya,Inequalities, 2nd ed., (Cambridge University Press, Cambridge, England, 1967).
5. M. M. Mizrachi,J. Math. Phys. 20(5):844 (1979);19:298 (1978);17:566 (1976).