1. R. Skomski, J. Phys.: Condens. Matter 15
2. B.D. Cullity, in Introduction to Magnetic Materials, ed. by M. Cohen (Addison- Wesley, Reading, MA, 1972)
3. H. Kojima, in Ferromagnetic Materials, vol. 3 ed. by E.P. Wohlfarth (North- Holland, Amsterdam, 1982)
4. X. Liu, W. Zhong, B. Gcu, Y. Du, J. Appl. Phys. 92
5. M. Matsumoto, A. Morisako, Sh. Takei, J. Alloys Compd. 326