1. The sol-gel process
2. C. J. Brinker and G.Scherer, Sol–Gel Science, the Physics and Chemistry of Sol–Gel Processing, Academic Press, London, 1990;
3. Sol-gel-derived coating films and applications
4. Sol–Gel Technology for Thin Films, Fibers, Preforms, Electronics and Specialty Shapes, ed. L. C. Klein, Noyes Publishers, Park Ridge, 1988;
5. Sol–Gel Optics: Processing and Applications, ed. L. C. Klein, Kluwer, Dordrecht, 1994;