1. B. Widom,J. Chem. Phys.
43:3892, 3898 (1965); L. P. Kadanoff,Physics
2:263 (1966).
2. M. E. Fisher,Rep. Prog. Phys.
30:615 (1967).
3. G. Stell, inProceedings of the International School of Physics “Enrico Fermi,” Critical Phenomena, Course LI, M. S. Green, ed. (Academic, New York, 1971), p. 188, and references therein. See also G. Stell,Phys. Rev. B
5:981 (1972).
4. M. E. Fisher, inProceedings of the Twenty-Fourth Nobel Symposium on Collective Properties of Physical Systems, Aspenäsgården, Sweden, 1973, B. Lundquist and S. Lundquist, eds. (Academic, New York, 1973), p. 16.
5. L. P. Kadanoff, inProceedings of the International School of Physics “Enrico Fermi,” Critical Phenomena, Course LI, M. S. Green, ed. (Academic, New York, 1971), p. 100; L. P. Kadanoff, inPhase Transitions and Critical Phenomena, C. Domb and M. S. Green, eds. (Academic, New York, 1976), Vol. 5A, p. 1.