1. The Physics of Liquid Crystals, Ed. by P. de Gennes (Clarendon Press, Oxford, 1974; Mir, Moscow, 1977).
2. T. W. Stinson and J. D. Litster, Phys. Rev. Lett. 30, 688 (1973).
3. L. V. Adzhemyan, L. Ts. Adzhemyan, A. Yu. Val’kov, et al., Zh. Éksp. Teor. Fiz. 87, 1244 (1984) [Sov. Phys. JETP 60, 712 (1984)].
4. M. A. Anisimov, E. E. Gorodetskii, and V. É. Podnek, Pis’ma Zh. Éksp. Teor. Fiz. 37, 352 (1983) [JETP Lett. 37, 414 (1983)].
5. V. Yu. Lerman, L. M. Sabirov, R. L. Sabirov, and T. M. Utarova, J. Mol. Struct. 348, 201 (1995).