1. Pyrazoles and their Benzo Derivatives
2. M. Okazaki, S. Kubodera and K. Minami-ashigara, German Patent DE 3737456 A1 (1987);
3. Chem. Abstr., 109, 201006z (1987).
4. Introduction to Nonlinear Optical Effects in Molecules and Polymers, P. N.Prasad and D. J.Williams, eds, John Wiley and Sons, Inc., New York, 1991.