References
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- Micheron , F. , Mayeux , C. , Hermosin , A. and Nicolas , J. 1974 . J. Amer. Cer. Soc. , 57 : 306
- Seglins , J. A. and Krumins , A. E. 1985 . Ferroelectrics 79 Minsk (in Russian)
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- Knite , M. 1987 . Actual Physical and Chemical Problems of Ferroelectrics , 108 Riga : Latvian State University . (in Russian)