1. J. Fricke, A. Emmerling: Aerogels-Preparation, Properties, Applications, In Structure and Bonding 77 (Springer, Berlin, Heidelberg 1992) pp. 37?87
2. Proc. Third Int'l Symp. on Aerogels, Würzburg, Germany (1991), ed. by J. Fricke in J. Non-Crystalline Solids 145(1?3) (North-Holland, Amsterdam 1992)
3. Springer Proc. Phys.,1986
4. J. Fricke: Aerogels. Sci. Am. 5, 68 (1988)
5. R. Vacher, E. Courtens, J. Pelouse: La Structure Fractale des aérogels. La Recherche, No. 220, 21, 426 (1990)