1. J. Smit, H.P.J. Wijn, Ferrites, Wiley, New York, 1959, p. 136 (Chapter 8).
2. W.H. Von Aulock, Handbook of Microwave Ferrite, Academic Press, New York, 1965, p. 353 (Section III, Chapter 6).
3. R. Vautier, M. Paulus, in: K.-H. Hellwge (Ed.), Landolt-Börnstein Numerical Data and Functional Relationships in Science and Technology (New Series), vol. 4, Part (b), Springer, Berlin, 1970, p.106 (Chapter 6.1.3).
4. Discussion of the paper by de Boer and Verwey