1. A. P. Kapustin, Experimental Study of Liquid Crystals (Nauka, Moscow, 1978) [in Russian].
2. P. Khabibullaev, E. Gevorkyan, and A. Lagunov, Reology of Liquid Crystals (Allerton, New York, 1994).
3. E. N. Kozhevnikov, Akust. Zh. 42, 800 (1996) [Acoust. Phys. 42, 705 (1996)].
4. E. N. Kozhevnikov, Akust. Zh. 56, 26 (2010) [Acoust. Phys. 56, 24 (2010)].
5. O. Kapustina, Properties of Liquid Crystals (Wiley, Weinheim, 1999).