1. J.S. Blakemore, J. Appl. Phys., 1982, 53, 10.
2. C. Kittel, Introduction to Solid State Physics, 6th edn., Wiley, New York, 1986.
3. J.P. McKelvey, Solid State and Semiconductor Physics, Harper International, New York, 1969, p. 266.
4. B.M. Welch, R.C. Eden and F.S. Lee, in Gallium Arsenide: Materials, Devices and Circuits, eds. M.J. Howes and D.V. Morgan, Wiley, Chichester, UK, 1985, p. 517.
5. J.C. Phillips, Bonds and Bands in Semiconductors, Academic Press, New York, 1973, Chapter 2.