1. A. Abragam, B. Bleaney: Electron Paramagnetic Resonance of Transition Ions ( Clarendon, Oxford 1970 )
2. A.G. Gurevich: Ferrites at Microwave Frequencies ( Heywood, London 1963 )
3. J. Griffiths: Nature 158, 670 (1946)
4. B. Lax, K.J. Button: Microwave Ferrites and Ferrimagnets ( McGraw-Hill, New York 1962 )
5. J. Helszajn: YIG Resonators and Filters ( Wiley, Chichester 1985 )