1. P. M. Marcus, J. F. Janak, and A. R. Williams, Computational Methods in Band Theory, Plenum Press, New York (1971).
2. M. L. Cohen and T. K. Bergstresser, Phys. Rev.141, 789 (1966).
3. J. C. Phillips, Bonds and Bands in Semiconductors, Academic Press, New York and London (1973).
4. E. O. Kane, J. Phys. Chem. Solids
1, 249 (1957).
5. G. F. Koster, Space Groups and their Representations, Academic Press, New York (1957).