1. R.M. White, “Quantum Theory of Magnetism” (Springer-Verlag, Berlin, 1983).
2. J.D. Jackson, “Classical Electrodynamics” (Wiley, New York, 1975).
3. B.D. Cullity, “Introduction to Magnetic Materials” (Addison-Wesley, Reading, 1972).
4. R.M. Bozorth, “Ferromagnetism” (D. van Nostrand, Toronto, 1951).
5. F. Mandl and G. Shaw, “Quantum Field Theory” (Wiley, New York, 1984).