1. M. E. Lines and A. M. Glass, Principles and Applications of Ferroelectrics and Related Materials (Clarendon, Oxford, 1977; Mir, Moscow, 1981).
2. G. A. Smolenskii, Dokl. Akad. Nauk SSSR 70, 405 (1950).
3. G. A. Smolenskii, Zh. Tekh. Fiz. 20, 137 (1950).
4. G. A. Smolenskii, Dokl. Akad. Nauk SSSR 85, 985 (1952).
5. E. Hegenbarth, Monatsber. Dtsch. Acad. Wiss. Berlin 1, 411 (1959).