[26] J. L. Cardy, J. Phys. A 17 , L385 (1984). [27] H. W. J. Bl¨ ote, J. L. Cardy and M. P. Nightingale, Phys. Rev. Lett. 56 , 742 (1986). [28] I. Affleck, Phys. Rev. Lett. 56 , 746 (1986). [29] B. Nienhuis, in Phase Transitions and Critical phenomena , eds. C. Domb and J. Lebowitz (Academic, London, 1987), Vol. 11 . [30] J.-A. Chen, C.-K. Hu and F. Y. Wu, J. Phys. A: Math. Gen. 31 , 7855 (1998). [31] I. Syozi, in Phase Transition and Critical Phenomena , eds. C. Domb and M. S. Green, (Aca- demic Press, London, 1972), Vol. 1 . [32] P. M. Ziff and P. N. Suding, J. Phys. A 30 , 5351 (1997). [33] C. R. Scullard and R. M. Ziff, Phys. Rev. E 73 , 045102 (2006). [34] R. Parviainen, J. Phys. A: Math. Theor. 40 , 9253 (2007). [35] M. F. Sykes and J. W. Essam, J. Math. Phys. 5 , 1117 (1964). [36] R. M. Ziff, Phys. Rev. E 73 , 016134 (2006). [37] F. Y. Wu, J. Phys. C 12 , L645 (1979). [38] C. R. Scullard and R. M. Ziff, arXiv: cond-mat/0911.2686. [39] P. N. Suding and R. M. Ziff, Phys. Rev. E 60 , 275 (1999). 31