1. Toulouse, G.: Commun. Phys.2, 115 (1977)
2. Binder, K., Young, A.P.: Rev. Mod. Phys.58, 801 (1986)
3. Young, A.P., Reger, J.D., Binder, K.: In: The Monte Carlo method in condensed matter physics, p. 355, Binder, K. (ed.). Berlin, Heidelberg, New York: Springer 1992
4. Sullivan, N.S., Devoret, M., Esteve, D.: Phys. Rev. B30, 4935 (1984)
5. Potts, R.B.: Proc. Camb. Philos. Soc.48, 106 (1952)