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2. T. Matsuhisa and S. Soejima, US Patent 4,280,845 (1981).
3. W. Vogel and W. Holand, “Advances in Ceramics,” Vol. 4, edited by J. H. Simmon, D. R. Uhlmann and G. H. Beall (American Ceramic Society, Columbus OH, 1982).
4. W. Zdaniewski, J. Amer. Ceram. Soc.
58 (1975) 163.
5. M. D. Karkhanavala and F. A. Hummel, ibid.
36 (1953) 389.