1. J. D. Mackenzie, in ?Ultrastructure Processing of Ceramic Glasses and Composites?, edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1984) p. 15.
2. S. Sakka, K. Kamiya, K. Makito and Y. Yamamoto, J. Non-Cryst. Solids 63 (1984) 223.
3. J. Zarzycki, in ?Glass Science and Technology?, Vol. 2, edited by D. R. Uhlmann and N. J. Kreidl (Academic Press, New York, 1984) p. 209.
4. J. Zarzycki, M. Prassas and J. Phalippou, J. Mater. Sci. 17 (1982) 3371.
5. G. Orcel and L. L. Hench, Mater. Res. Soc. Symp. Proc. 32 (1984) 79.