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2. Sonin, A.S. and Strukov, B.A., Vvedenie v segnetoelektrichestvo (Introduction to Ferroelectricity), Moscow: Vysshaya Shkola, 1970.
3. Vaks, V.G., Vvedenie v mikroskopicheskuyu teoriyu segnetoelektrikov (Introduction to Microscopic Theory of Ferroelectrics), Moscow: Nauka, 1973.
4. Blinc, R. and Žekš, B., Soft Modes in Ferroelectrics and Antiferroelectrics, Amsterdam: North-Holland Publ., 1974.
5. Lines, M.E. and Glass, A.M., Principles and Applications of Ferroelectrics and Related Materials, Oxford: Clarendon Press, 1977.