1. P. N. Prasad and D. J.Williams, Introduction to Nonlinear Optical Effects in Molecules and Polymers, Wiley, New York, 1991.
2. R. A. Hann and D.Bloor, Organic Materials for Non-linear Optics, Royal Society of Chemistry, London, 1989.
3. D. S. Chemla and J.Zyss, Nonlinear Optical Properties of Organic Molecules and Crystals, Academic Press, Orlando, FL, 1987, vol. 1 and 2.
4. Second-harmonic generation in Langmuir–Blodgett monolayers of stilbazium salt and phenylhydrazone dyes