1. I. C. Khoo, Liquid Crystals, 2nd ed. (Wiley Interscience, New York, 2007).
2. L. M. Blinov, Electro–and Magnetooptics of Liquid Crystals (Nauka, Moscow, 1978) [in Russian].
3. P. de Gennes, The Physics of Liquid Crystals (Clarendon, Oxford, 1974).
4. S. Chandrasekhar, Liquid Crystals (Cambridge Univ. Press, Cambridge, 1977).
5. N. Bloembergen, Nonlinear Optics (Benjamin, New York, 1965).