1. Maletta, H. and Felsch, W., Phys. Rev. B 20, 1245 (1979).PRBMDO0163-1829
2. Ferré, J., Pommier, J., Renard, J. P. and Knorr, K., J. Phys. C 13, 3697 (1980).JPSOAW0022-3719
3. Rajchenbach, J., Ferré, J. and Malletta, H. EPS Conference (Anvers) (to be published in Sol. St. Commun.).
4. Rajchenbach, J., These de 3éme Cycle (unpublished).
5. For a review see Mydosh, J. A., to be published in “Advanced study Institute on liquïds and amorphous metals.” Plenum Press N. Y. (1980).