1. J. A. Koningstein, in: H. A. Szymanski, Raman Spectroscopy, Plenum Press, New York (1967), Vol. 1, p. 82.
2. G. B. Wright, Ed., Light Scattering Spectra of Solids, Springer, New York (1969).
3. N. Bloembergen, Am. J. Phys. 35: 989 (1967).
4. H. W. Schrötter, Naturwiss. 54: 607 (1967).
5. C. J. Schuler, “Laser Induced Spontaneous and Stimulated Raman Scattering,” in: Progress in Nuclear Energy IX, Pergamon Press (1968), Vol. 8, p. 2.