1. B. T. Matthias, C. E. Miller, and J. P. Remeika, Phys. Rev. 104, 849 (1956).PHRVAO0031-899X
2. S. Hoshino, T. Okaya, and R. Pepinsky, Phys. Rev. 115, 323 (1959).PHRVAO0031-899X
3. See, for example, F. Jona and G. Shirane, Ferroelectric Crystals (Pergamon Press, Ltd., Oxford, England, 1962).
4. R. Blinc, S. Detoni, and M. Pintar, Phys. Rev. 124, 1036 (1961).PHRVAO0031-899X
5. R. Hoshino, J. Phys. Soc. Japan 17, 119 (1962).JUPSAU0031-9015