References
- Blinc , R. and Levanyuk , A. P. 1986 . Incommensurate phases in dielectrics , New York : North-Holland Physics Publishing .
- Sekine , T. , Takayama , M. , Uchinokura , K. and Matsuura , E. 1986 . J. Phvs. Soc. Jpn. , 55 : 3903
- Onodera , A. , Watanabe , O. and Haga , H . 1992 . Ferroelectrics , 125 : 141
- lizumi , M. , Axe , J. D. , Shirane , G. and Shimaoka , K. 1977 . Phys. Rev. B , 15 : 4392
- Chen , M. B. and Walker , Z. Y. 1990 . Phvs. Rev. Let. , 65 : 1223
- Ahn , H. Y. , Jeong , S. Y. , Jang , M S. and Cheung , W. S. 1995 . Cry. Res. Tech. No. , to be published
- Jonsher , A. K. 1983 . Dielectric relaxation in solids , London : Chelsea Dielectrics press .
- Levanyuk , A. P. and Sigov , A. S. 1987 . Defects and structure phase transitions , London : Gordon and Breach .