1. H. W. Ott , Noise Reduction Techniques in Electronic Systems, Wiley, New York, 2nd edn., 1987, p. 55
2. C. R. Paul , Introduction to Electromagnetic Compatibility, Wiley, New York, 1992
3. A. Goldman , Handbook of Ferromagnetic Materials, Kluwer, Boston, 1999, p. 646
4. E. P. Wolfarth , Ferromagnetic Materials – A Handbook on the Properties of Magnetically Ordered Substances, Elsevier, Amsterdam, 1986, vol. 2