1. Multiplets of Transition-Metal Ions in Crystals;Sugano,1970
2. The Theory of Transition-Metal Ions;Griffith,1961
3. The Irreducible Tensor Method for Molecular Symmetry Groups;Griffith,1962
4. Spectroscopic Properties of Rare Earths;Wybourne,1965
5. Optical Absorption Intensities of Rare-Earth Ions