1. Buschow, K.H.J.: Phys. Stat. Sol. (a)7, 199 (1971)
2. Buschow, K.H.J., Velge, W.A.J.J.: Z. Angew. Phys.26, 157 (1969)
3. Livingston, J.D., McConnell, M.D.: J. Appl. Phys. (in the press)
4. Schweizer, J., Tasset, F.: Int. Conf. on Magnetism, Moscow 1973
5. Tasset, F.: Thesis 1975