1. Tishchenko, V. G., Makhotilo, A., Cherkashina, R. M., Klepov, A. G., Bezina, T. A., Kuzmenok, N. V. and Lisestky, L. N. 1980. “Properties and Applications of Liquid Crystal Thermoindicators”. 17Novosibirsk (in Russian).
2. Heilmeier, G. 1969. “Liquid Crystals”. Edited by: Brown, G. H. Vol. 2, 1223
3. Kapustin, A. P. 1978. “Experimental Studies on Liquid Crystals”. Moscow (in Russian).