1. K. M. Prewo, J. J. Brennan and G. K. Layden, Am. Ceram. Soc. Bull. 65 (1986) 305.
2. K. M. Prewo, J. Mater. Sci. 21 (1986) 3590.
3. J. J. Brennan and K. M. Prewo, ibid. 17 (1982) 1201.
4. J. J. Brennan and M. P. Taylor, US Pat. 4485 179 (1984).
5. J. W. Halloran, in ?Ultrastructure Processing of Ceramics, Glasses and Composites? (edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1984) p. 404.