1. See, for example, ‘Semi-conductor Optical Bistability: Towards the Optical Computer’ by B. S. Wherett in Nonlinear Optics: Materials and Devices, eds. C. Flytzanis and J. L. Oudar, Springer Proceedings in Physics, Springer, Berlin (1986).
2. J. Opt. Soc. Am. B feature issue on ‘Excitonic Optical Nonlinearities’, ed. D. S. Chemla 2(7) (1985) and references therein.
3. Quantum Electronics — Principles and Applications Series,1987
4. Y. R. Shen: The Principles of Nonlinear Optics, John Wiley, New York (1984).
5. J. Jerphagnon, S. Kurtz, and J. L. Oudar: ‘Nonlinear Dielectric Susceptibilities of Crystal’, vol. 18, p. 456 in Landolt and Bornstein New Series, ed. K. H. Hellwege and A. M. Hellwege Springer Verlag, Berlin (1984).