1. P.G. de Gennes: The Principles of Liquid Crystals (Oxford, Charendon Press, 1974).
2. L.M. Blinov: Electro-and Magnetooptics of Liquid Crystals (Moscow, Nauka, 1978) (in Russian).
3. S. Chandrasekhar: Liquid Crystals, (Cambridge-New York-Melburn, Cambridge University Press, 1977).
4. V.A. Belyakov, A.S. Sonin: Optics of Cholesteric Crystals (Moscow, Nauka, 1982) (in Russian).
5. V.A. Belyakov, V.E. Dmitrienko: Uspakhi Fiz. Nauk 146, 369 (1985) [Sov. Phys. — Usp. 28, 535 (1985)].