1. Fisher, M.E. and W. Selke, Phys. Rev. Lett. 44 (1980) 1502.
2. For previous reviews, see Bak, P., Rep, Prog. Phys. 45 (1982) 587
3. Fisher, M.E. and D.A. Huse, Melting, Localization, and Chaos. Kalia, R.K., Vashishta, P. (eds.) p. 259. New York: Elsevier 1982
4. Selke W., Modulated Structure Materials. Tsakalakos, T. (ed.) p. 23. Dordrecht, Boston, Lancaster: Martinus Nijhoff 1984; Yeomanns, J., preprint 1987.
5. de Fontaine, D. and J. Kulik, Acta Metall. 33 (1985) 145.