References
- Lines , M. E. and Glass , A. M. 1977 . Principles and Applications of Ferroelectrics and Related Materials , Oxford : Clarendon Press .
- Aïn , M. 1997 . Phys. Rev. Lett. , 78 : 1560
- Levanyuk , A. P. 1986 . Incommensurate Phases in Dielectrics , Edited by: Blinc , E. and Levanyuk , A. P. Amsterdam : Elsevier . D.G. Sannikov, ibidem
- Braden , M. 1998 . Phys. Rev. Lett. , 80 : 3634
- Janssen , T. 1986 . Incommensurate Phases in Dielectrics , Edited by: Blinc , E. and Levanyuk , A. P. Amsterdam : Elsevier .
- Poggi , P. and Ruffo , S. 1997 . Physica D , 1561 : 1
- Szeftel , J. and Laurent , P. 1998 . Phys. Rev. E , 57 : 1134