1. See, for example, M. Altarelli: 1981, Phys. Rev. Lett. 46, 205 and references therein. See also Y.C. Chiang, T.C. McGill and D.L. Smith: 1981, Phys. Rev. B
23, 4169.
2. See, e.g., L. Resca: 1987, Phys. Rev. B
36, 4452; N. Chand, T. Henderson, J. Klem, W.T. Masselink, R. Fischer, Y.C. Chiang and H. Morkoc: 1987, Phys. Rev. B
36, 445.
3. S.T. Pantelides: 1979, Solid State Commun. 30, 65.
4. The nearest thing to a derivation I have seen is in a paper by T. Gora and F. Williams in Handbook on Semiconductors, W. Paul (ed.), North Holland, Amsterdam, 1982, Vol. 1, p. 639. A number of crucial steps are omitted. The final equation does not follow from those given.
5. The Physics of Semiconductors, E.M. Anastassakis and J.D. Joannopoulos (eds.), World Scientific, Singapore, 1990, three volumes.