References
- 1981 . Ferroelectric and Related Substances; Oxides , Landolt-BörnsteinNew Series Vol. III/16a , Berlin : Springer-Verlag .
- Kelt , R. C. and Hellicar , N. J. 1956 . Acustica , 6 : 235
- Payne , W. H. and Tennery , V. J. 1965 . J. Amer. Ceram. Soc. , 48 : 413
- Smolenskii , G. A. and Isupov , V. A. 1954 . Zh. Tekh. Fiz. , 24 : 1375
- Matsubara , T. and Yoshimitsu , K. 1980 . Prog. Theor. Phys. , 64 : 380