12 [51] A.M. Ferrenberg and D.P. Landau, Phys. Rev. B 44 , 5081 (1991). [52] C.N. Kaplan and A.N. Berker, Phys. Rev. Lett. 100 , 027204 (2008). [53] J.-K. Kim, Phys. Rev. B 53 , 3388 (1996). [54] M. Suzuki, Prog. Theor. Phys. 51 , 1992 (1974). [55] X. T. Wu, Phys. Rev. B 79 , 184208 (2009). [56] J. W. Essam, Rep. Prog. Phys. 43 , 33 (1980). [57] X. T. Wu, private cumunication. [58] A. Malakis, A.N. Berker, I.A. Hadjiagapiou, N.G. Fytas, and T. Papakonstantinou, Physica A (to appear), also at arXiv:0912.4586. [59] A. Aharony and A.B. Harris, Phys. Rev. Lett. 77 , 3700 (1996); S. Wiseman and E. Domany, ibid. 81 , 22 (1998); S. Wiseman and E. Domany, Phys. Rev. E 58 , 2938 (1998); D.S. Fisher, Phys. Rev. B 51 , 6411 (1995); D.A. Huse and D.S. Fisher, ibid. 35 , 6841 (1987) ; V. Privman and M.E. Fisher, J. Stat. Phys. 33 , 385 (1983). [60] A.K. Hartmann and H. Rieger, Optimization Problems in Physics (Wiley-VCH, 2002). [50] R.E. Belardinelli and V.D. Pereyra, Phys. Rev. E 75 , 046701 (2007). [49] C.J. Silva, A.A. Caparica, and J.A. Plascak, Phys. Rev. E 73 , 036702 (2006). [48] P.D. Beale, Phys. Rev. B 33 , 1717 (1986). [47] P. Nightingale, J. Appl. Phys. 53 , 7927 (1982). [46] P.F. Fox and A.J. Guttmann, J. Phys. C 6 , 913 (1973); T.W. Burkhardt and R.H. Swendsen, Phys. Rev. B 13 . 3071 (191976); W.J. Camp and J.P. Van Dyke, ibid. 11 , 2579 (1975). [45] M.J. Stephen and J.L. McColey, Phys. Rev. Lett. 44 , 89 (1973); T.S. Chang, G.F. Tuthill, and H.E. Stanley, Phys. Rev. B 9 , 4482 (1974); G.F. Tuthill, J.F. Nicoll, and H.E. Stanley, ibid. 11 , 4579 (1975); F.J. Wegner, Phys. Lett. 54A , 1 (1975). Berker and M. Wortis, Phys. Rev. B 14 , 4946 (1976); M. Kaufman, R.B. Griffiths, J.M. Yeomans, and M. Fisher, ibid . 23 , 3448 (1981); W. Selke and J. Yeomans, J. Phys. A 16 , 2789 (1983); D.P. Landau and R.H. Swendsen, Phys. Rev. B 33 , 7700 (1986); J.C. Xavier, F.C. Alcaraz, D. Pena Lara, and J.A. Plascak, ibid. 57 , 11575 (1998).