1. R.W.G. Wyckoff, Crystal Structures, Interscience Publishers, New York, 1994.
2. Space Groups and Their Representations
3. F. Bassani, Electronic States and Optical Transitions in Solids, Pergamon Press, New York, 1975.
4. Landolt–Börnstein Tables, New Series, vol. 17b, Springer-Verlag, Berlin, 1982.