1. C. J. Ballhausen:Introduction to Ligand Field Theory (New York, N. Y., 1962).
2. B. Di Bartolo:Optical Interactions in Solids (New York, N. Y., 1968).
3. B. N. Figgis:Introduction to Ligand Fields (New York, N. Y., 1966).
4. H. L. Schläfer Glieman:Basic Principles of Ligand Field Theory (London, 1966).
5. H. Watanabe:Operator Methods in Ligand Field Theory (Tokyo, 1966).