1. Y.R. Shen, The Principles of Nonlinear Optics ( Wiley, New York, 1984 ).
2. M.D. Levenson, Introduction To Nonlinear Laser Spectroscopy ( Academic Press, New York, 1982 ).
3. Reviewed in the book Optical Phase Conjugation, R.A. Fisher, ed. (Academic Press, New York, 1982).
4. P.K. Tien, Rev. Mod. Phys. 49, 361 (1977).
5. In Surface Polaritons, Electromagnetic Waves at Surfaces and Interfaces V.M. Agranovich and D.L. Mills, eds. (North-Holland, Amsterdam, 1982).