1. T. Noguchi andM. Mizuno,Bull. Chem. Soc. Jpn 41 (1968) 2695.
2. H. Toraya, M. Yoshimura andS. Somiya,J. Amer. Ceram. Soc. 67 (1984) C119.
3. C. A. Bateman, MSc Dissertation, Lehigh University, USA (1986).
4. E. T. Turkdogan, in ?Physical Chemistry of High Temperature Technology? (Academic Press, New York, 1980).
5. J. E. Burke et al., Mater. Sci. Res. 13 (1979) 417.