1. T. S. Moss, G. J. Burrell, and B. Ellis, Semiconductor Opto-Electronics, John Wiley, New York (1973), Chapter 3.
2. J. I. Pankove, Optical Processes in Semiconductors, Prentice-Hall, New York (1971), Chapter 3.
3. C. Kittel, Introduction to Solid State Physics, Fifth Edition, John Wiley, New York (1976), pages 209–211.
4. See, for example, J. M. Stone, Radiation and Optics, McGraw-Hill, New York (1963), pages 376–383.
5. T. S. Moss et al, Reference 1, pages 55–69.