1. Yu.P. Bobylev, S.A. Pikin, Zh. Eksp. Teor. Fiz. 72, 369 (1977) (Sov. Phys. JETP 45, 195 (1977)).
2. P.G. de Gennes, J. Prost, The Physics of Liquid Crystals (Clarendon Press, Oxford, 1993).
3. Y.G. Marinov, H.P. Hinov, Eur. Phys. J. E 31, 179 (2010).
4. V.P. Romanov, G.K. Sklyarenko, Zh. Eks. Teor. Fiz. 112, 1675 (1997).
5. V.P. Romanov, G.K. Sklyarenko, JETP 85, 914 (1997).