1. Reichardt, C.: Solvents and Solvent Effects in Organic Chemistry, VCH, Weinheim (1988)
2. Reichardt, C.: Chem. Rev. 94, 2319–2358 (1994)
3. Kanis, D.R., Ratner, M.A., Marks, T.J.: Chem. Rev. 94, 195–242 (1994)
4. Verbiest, T., Houbrechts, S., Kauranen, M., Clays, K., Persoons, A.: J. Mater. Chem., 7, 2175–2189 (1997)
5. Zyss, J., Chemla, D.S. (eds): Nonlinear Optical Properties of Organic Molecules and Crystals, Academic, Orlando (1987)