1. I.C. Khoo, “Liquid Crystals Physical Properties and Nonlinear Optical Phenomena,” Wiley, NY (1994).See also I. C. Khoo and S. T. Wu, “Optics and Nonlinear Optics of Liquid Crystals,” World Scientific, Singapore (1993).
2. I. C. Khoo, “Nonlinear Optics of Liquid Crystals,” in Progress in Optics, Vol. XXVI, ed. E. Wolf, North Holland, Amsterdam (1988).
3. N. V. Tabiryan, A. V. Sukhov and B. Ya. Zeldovich, “The Orientational Optical Nonlinearity of Liquid Crystals,” Mol. Cryst. Liq. Cryst., Vol. 136, p. 1 (1986). See also Zolotko.
4. I. C. Khoo, R. R. Michael and G. M. Finn, “Self-phase Modulation and Optical Limiting of a Low Power CO2 Laser with a Nematic Liquid-crystal Film,” Appl. Phys. Letts., 52, 2108 (1988).
5. I. C. Khoo, Sukho Lee, P. LoPresti, R. G. Lindquist and Hong Li, “Isotropic Liquid Crystal Film and Fiber Structure for Optical Limiting Application,” Int. J. Nonlinear Optical Phys. Vol. 2, No. 4 (1993).