1. P. Schwarzkopf andR. Kieffer (in collaboration with W. Leszynski and F. Benesovsky), ?Refractory Hard Metal-Borides, Carbides Nitrides and Silicides? (Macmillan, New York, 1953) p. 271.
2. J. D. Latva,Met. Progr. 82 (1962) 139.
3. Y. Mimura, N. Imamura, K. Kobayashi, A. Okada andY. Kushiro,J. Appl. Phys. 49 (1978) 1208.
4. M. Nage, S. Hasunuma, Y. HoshiandS. Yamanaka,IEEE Trans. Magn. MAG-17 (1981) 3184.
5. A. J. Shuskus, T. M. Reeder andE. L. Paradis,Appl. Phys. Lett. 24 (1974) 155.