1. S. Krupička, Physics of ferrites and related oxides, Academia, Prague 1969 (in Czech, prepared for publication in German).
2. Yu. D. Tretyakov, Thermodynamic of ferrites, Khimia, Leningrad 1967, in Russian.
3. Z. Śimša andP. Holba, J. Thermal Anal., 3 (1971) 17.
4. A. H.Inverson, U. S. Patent 2,846,655 (Aug. 5, 1958) “Impregnated Ferrites”, as well as M. B.Vilensky, U. S. Patent 3,188,400 (June 8, 1965) “Ferrite counting”.
5. D. W. Collins andL. N. Mulay, J. Am. Ceram. Soc., 53 (1970) 74.