1. C. J. BRINKER and G. W. SCHERER,J. Non-Cryst. Solids 70 (1985) 301.
2. C. J. BRINKER, G. W. SCHERER and E. P. ROTH,ibid. 72 (1985) 345.
3. G. W. SCHERER, C. J. BRINKER and E. P. ROTH,ibid. 72 (1985) 369.
4. M. YAMANE, S. INOUE and A. YASUMORI,ibid. 63 (1984) 13.
5. ASTM cards N.17/447, 30/767, 29/829.