1. M. Scheucher and H. Spohn,J. Stat. Phys. 53:279 (1988).
2. B. Hede and V. Privman,J. Stat. Phys. 65:379 (1991).
3. P. Meakin, inPhase Transitions and Critical Phenomena, Vol. 12, C. Domb and J. L. Lebowitz, eds. (Academic Press, New York, 1988), p. 336.
4. J. D. Gunton, M. San Miguel, and P. S. Sahni, inPhase Transitions and Critical Phenomena, Vol. 8, C. Domb and J. L. Lebowitz, eds. (Academic Press, New York, 1983), p. 269.
5. V. Kuzovkov and E. Kotomin,Rep. Prog. Phys. 51:1479 (1988).