1. P. G. de Gennes, Liquid Crystals (Clarendon, Oxford, 1974).
2. M. Kleman and O. D. Lavrentovich, Soft Matter Physics: An Introduction (Partially Ordered Systems) (Springer, Berlin, Heidelberg, 2002; Fizmatlit, Moscow, 2007).
3. Defects in Liquid Crystals: Computer Simulations, Theory and Experiments, Ed. by O. Lavrentovich, P. Pasini, C. Zannoni, and S. Zumer (Springer, Netherlands, 2001).
4. M. V. Kurik and O. D. Lavrentovich, Sov. Phys. Usp. 31, 196 (1988).
5. O. A. Skaldin, V. A. Delev, E. S. Shikhovtseva, Yu. A. Lebedev, and E. S. Batyrshin, J. Exp. Theor. Phys. 121, 1082 (2015).