1. 1E.M. Gyorgy, D.W. Johnson, and E.M. Vogel ; to be published in Proceedings of the 3rd International Conference on Ferrites, Japan, 1980 .
2. 2C.M. Ringel ; private communication.
3. 3W.R. Jones ; private communication.
4. 4W.F. Brown ; pp.8 -9 inMicromagnetics , Interscience Publishers, New York, 1963 .
5. 5E.M. Gyorgy, and N.B. Hannay ; pp.395 -467 inTreatise on Solid State Chemistry . Vol. 2 . Plenum, New York, 1975 .