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2. A.P. Kapustin,Elekroopticheskyie i Akusticheskie Svoistva Zhidkikh Kristallov (Electrooptical and Acoustical Properties of Liquid Crystals)Nauka, Moscow, 1973, 232 p. (in Russian).
3. L.M. Blinov,Electro-Optical and Magneto-Optical Effects in Liquid Crystals, Wiley, Chichester, 1984.
4. S.A. Pikin,Structural Transformations in Liquid Crystals, Gordon and Breach, New York, 1991.
5. V.G. Chigrinov,Kristallografiya 27, 404 (1982).