1. S. PROCHAZKA, in “Ceramics for High Performance Applications,” edited by J. J. Burke, A. E. Gorum and R. N. Katz (Brook Hill, Chestnut Hill, Massachusetts, 1974) p. 239.
2. W. BOCKER, H. LANDFERMANN and H. HAUSNER,Powder Met. Int. 11 (2) (1979) 83.
3. R. M. WILLIAMS, B. N. JUTERBOCK, S. S. SHINOZAKI, C. R. PETERS and T. J. WHALEN,Am. Ceram. Soc. Bull. 64 (1985) 1385.
4. C. GRESKOVICH and J. M. ROSOLOWSKI,J. Am. Ceram. Soc. 59 (1976) 334.
5. F. F. LANGE and T. K. GUPTA,ibid. 59 (1976) 537.