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2. V.A. Belyakov, V.E. Dmitrienko, Uspakhi Fiz. Nauk 146, 369 (1985) [Sov. Phys. - Usp. 28, 535 (1985)]
3. P.G. de Gennes, The Principles of Liquid Crystals (Charendon Press, Oxford, 1974)
4. S. Chandrasekhar, Liquid Crystals (Cambridge University Press, Cambridge-New York-Melburn, 1977)
5. M.A. Osipov, Fiz. Tv. Tela 27, 1651 (1985)