1. *. Presented at the Eleventh Annual Workshop at The University of Georgia, Athens, Georgia, USA, 23–27 February 1998, and in Computer Simulation Studies in Condensed Matter Physics XI, D. P. Landau, K. K. Mon, and H.-B. Schuttler ed. (Springer-Verlag, Berlin, 1999).
2. +. Electronic address: huck@phys.sinica.edu.tw; www site, http://www.sinica.edu.tw/ statphys/
3. P. J. Reynolds, H. E. Stanley, and W. Klein, J. Phys. A 11, L199 (1978); Phys. Rev. B 21, 1223 (1980).
4. C.-K. Hu, Phys. Rev. B 46, 6592 (1992).
5. C.-K. Hu, J. Korean Physical Soc. (Proc. Suppl.), 29, S97–101 (1996).