1. R. Brout, Phase Transitions (Frontiers of Physics), New York (1965).
2. H. E. Stanley, Introduction to Phase Transitions and Critical Phenomena, Oxford (1971).
3. N. G. Van-Kampen, Phys. Rev.,135, A362 (1964).
4. J. L. Lebowitz and O. Penrose, J. Math. Phys.,7, 98 (1966).
5. P. C. Hemmer and J. L. Lebowitz, ?Systems with weak long-range potentials,? in: Phase Transitiens and Critical Phenomena (eds M. S. Green and C. Domb), Academic Press, New York (1973).