1. P.L. Taylor, A Quantum Approach to the Solid State, Prentice-Hall, New York, 1970.
2. H. Haken, Quantum Field Theory of Solids, An Introduction, North-Holland, Amsterdam, 1976.
3. A.L. Fetter, J.D. Walecka, Quantum Theory of Many-Particle Systems, McGraw-Hill, New York, 1971.
4. Exchange interactions in magnetic insulators
5. S.-K. Ma, Modern Theory of Critical Phenomena, Benjamin, New York, 1976.