1. Charles G. Greskovich , Cusano Dominic , Hoffman David , and Riedner Robert J. , Bull. Am. Ceram. Soc. 71 (1992) p. 1120.
2. Prochazka S. in Special Ceramics 6 edited by P. Popper (1971)p. 171.
3. Burton W.K. , Cabrera N. and Frank F.C.
4. Burke J.E. in Sintering of Advanced Ceramics, Ceramic Transactions 7 (American Ceramic Society, Westerville, Ohio,, 1990)p. 215.
5. Coble R.L. and Burke J.E. Progress in Ceramic Science 3, edited by Burke J.E. p. 199.