1. Villain, J.: Ordering in strongly fluctuating condensed matter systems, Geilo, 1979. Riste T. (ed.). New York: Plenum Press 1980
2. Bak, P.: Rep. Prog. Phys.45, 587 (1982)
3. Fisher, M.E., Huse, D.A.: Melting, localization and chaos. Kalia, R.K., Vashishta, P. (eds.), p. 259. New York: Elsevier 1982
4. Fisher, M.E., Selke, W.: Phys. Rev. Lett.44, 1502 (1980); Philos. Transact. R. Soc.302, 1 (1981)
5. Selke, W., Fisher, M.E.: Phys. Rev. B21, 257 (1979)