1. Proceedings of the 1968 Int. Conf. on Light Scattering Spectra of Solids, G. B. Wright, Editor (Springer-Verlag, New York, 1969).
2. Light is also scattered by fluctuations of the magnetic susceptibility. However the contribution to the scattered intensity from fluctuations in the magnetic susceptibility is very much smaller than that from fluctuation in the electric susceptibility of comparable amplitude, and is therefore, in general, neglected.
3. J. M. Worlock and S. P. S. Porto, Phys. Rev. Letters 15, 697(1965).
4. R. Loudon, Advances in Physics 13, 423(1964).
5. E. Burstein, R. Ito, A. Pinczuk and M. Shand, Proc. 1969 Symposium on the Interactions of Light with Sound Waves, J. Acoust. Soc. (in press).