References
- Frazer , B. C. 1971 . Structural Phase Transitions and Soft Mode , 48 Oslo : Universitetsforlaget .
- Bock , H. 1979 . Diplomarbeit , Universität Saarbrücken .
- Schollmayer , R. 1976 . Dissertation Universität Saarbrücken .
- Harada , J. , Axe , J. D. and Shirane , G. 1971 . Phys. Rev. , B4 : 155
- Schildkamp , W. and Fischer , K. 1981 . Zeit. Krist. , 155 : 217
- Hewat , A. W. 1972 . J. Phys. C: Sol. State Phys. , 5 : 1309
- Comes , R. , Lambert , M. and Guinier , A. 1970 . Acta Cryst. , A26 : 244
- Harada , J. , Pedersen , T. and Barnea , Z. 1970 . Acta Cryst. , A26 : 336
- Willis , B. T. M. and Pryor , A. W. 1975 . Thermal Vibrations in Crystallography , 150 Cambridge University Press .
- Tanaka , M. , Shiozaki , Y. and Sawaguchi , E. 1979 . J. Phys. Soc. Japan , 47 : 1588