References
- Prisedsky , V. V. , Komarov , V. P. , Pan'ko , G. F. and Klimov , V. V. 1980 . Ferroelectrics , v. 1/2 : 23
- Prisedsky , V. V. , Komarov , V. P. , Pan'ko , G. F. , Dobrikov , A. A. and Klimov , V. V. 1979 . Doclady AN SSSR , v. 247 ( 3 ) : 620