1. C. J. Brinker and G. W. Scherer, Sol-Gel Science, Academic Press, New York, 1990.
2. S. Sakka, K. Aoki, H. Kozuka and J. Yamaguchi, Preparation of high surface area sol-gel Pd/Si02 catalysts, J. Mat. Syth. Proc., 2 (1994) 305–314.
3. S. Sakka, K. Aoki, H. Kozuka and J. Yamaguchi, Sol-gel synthesis of silica disc as applied to supports of organic molecules with optical functions, J. Mater. Sci., 28 (1993) 4607–4614.
4. D.-G. Chen, B. G. Potter and J. H. Simmons, Ge02–5i02 thin films for planar wave-guide applications, J. Non-Cryst. Solids, 178 (1994) 135–147.
5. S. Shibata, Sol-gel derived silica preforms for optical fibers, J. Non-Cryst. Solids, 178 (1994) 272–283.