1. L. Brillouin: Scattering of light and X-rays by a transparent homogeneous body: Influence of the thermal agitation (in French). Ann. Pysique 17, 88–122 (1922)
2. L.I. Mandelstam: On light scattering by an inhomogeneous medium (in Rus¬sian). Zh. Russko Fiz. Khim. Obshch. (J. Russian Physico-Chemical Soc.) 58, 381 (1926)
3. Y. R. Shen: The Principles of Nonlinear Optics (Wiley, New York 1989 ) D. L. Mills: Nonlinear Optics (Springer, Berlin, Heidelberg 1991 )
4. H. Haug, S. W. Koch: Quantum Theory of Optical and Electronic Properties of Semiconductors ( World Scientific, Singapore 1990 )
5. E Henneberger, S. Schmidt-Rink, E. O. Göbel (eds.): Optics of Semiconductor Nanostructures ( Akademie, Berlin 1993 )