1. Vaks, V.G., Vvedenie v mikroskopicheskuyu teoriyu segnetoelektrikov (Introduction into Ferroelectrics Microscopy Theory), Moscow: Nauka, 1973.
2. Levitskii, R.R., Korinevskii, N.A., and Stasyuk, I.V., Ukr. Fiz. Zh., 1974, vol. 19, no. 8, p. 1289.
3. Levitskii, R.R., Zachek, I.R., Vdovych, A.S., and Sorokov, S.I., Z. Phys. Condens. Matter, 2009, vol. 12, no. 1, p. 75.
4. Stasyuk, I.V., Levitskii, R.R., Zachek, I.R., and Moina, A.P., Phys. Rev. B, 2000, vol. 62, no. 10, p. 6198.
5. Levitskii, R.R., Zachek, I.R., Vdovych, A.S., and Moina, A.P., J. Phys. Stud., 2010, vol. 14, no. 1, p. 1701.