1. J. D. Gunton, M. San Miguel and P. S. Sahni, in Phase Transitions and Critical Phenomena, Vol. 8, eds. C. Domb and J. L. Lebowitz (Academic, New York, 1983) p. 267.
2. A. Bray, to appear in Advances in Physics (1994).
3. The Monte Carlo method is discussed in detail in K. Binder and D. Heermann, Monte Carlo Methods in Statistical Physics: An Introduction,(Springer-Verlag. Heidelberg, 1988). “In [28] the next order (post-Gaussian) approximation for a NCOP is developed and leads to qualitative improvement in the theory in ways described there
4. A diluted antiferromagnet in a field is an example of the much studied random field Ising model. For references see Z. - W. Lai, G. F. Mazenko, and O. T. Valls, Phys. Rev. B 37, 9481 (1988).
5. M. Kleman, Points,Lines and Walls in Liquid Crystals, Magnetic Systems and Various Ordered Media (Wiley, New York, 1983).