References
- Hamano , K. 1986 . Incommensurate Phases in Dielectrics , Edited by: Blinc , R. and Levanyuk , A. P. Vol. 1 , Amsterdam, Oxford, New York, Tokyo : North-Holland . Chap. 9
- Ema , K. , Hamano , K. and Maruyama , H. 1988 . J. Phys. Soc. Jpn. , 57 : 2174
- Ema , K. , Hamano , K. and Levanyuk , A. P. to be published