1. J. W. Hastie, E. R. Plante andD. W. Bonnel, Report NBSIR-83-2731 (National Institute of Standards and Technology, Washington, DC, 1983).
2. H. Yamanaka, R. Terai andS. Hara,Osaka Kogyo Gijutsu Shikenjo Kiho (Bull. Govt. Inst., Osaka)34 (1983) 228.
3. M. Asano, T. Harada andY. Mizutani,High Temp. Sci. to be published.
4. M. Asano, T. Kou andY. Yasue,J. Non-Cryst. Solids 92 (1987) 245.
5. M. Asano, T. Kou andY. Mizutani,ibid. 112 (1989) 381.