1. M. Sagawa, S. Fujimura, N. Togawa, H. Yamamoto andY. Matsuura J. Appl. Phys. 55 (1984) 2083.
2. K. H. J. Buschow,Mater. Sci. Rep. 1 (1986) 1.
3. D. Howe, T. S. Birch andP. Gray, Ninth International Workshop on Rare-Earth Magnets and their Applications, Bad Soden, 31st Aug–2 Sept, 1987. (Ref. No. W2.1)
4. J. Jacobson andA. Kim,J. Appl. Phys. 61 (1987) 3763.
5. K. Ohashi. Y. Tawara, T. Yokoyama andN. Kobayashi, Ninth International Workshop on Rare-Earth Magnets and their Applications, Bad Soden, 31 Aug–2 Sept, 1987. (Ref. No. WP6.6)