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2. R. Kubo, T. Nagamiya: Solid State Physics (McGraw-Hill, Inc. 1969 )
3. C. C. Kittel, J.K. Galt: Solid State Physics 3, 437 (1956)
4. S. Chikazumi: Physics of Magnetism ( John Wiley & Sons, New York 1964 )
5. J. Smit, H.P.J. Wijn: Ferrites (Philips Technical Library 1959 )