1. I. E. Neimark and R. Yu. Sheinfain, Silica Gel, Its Production, Properties, and Application (Nauk. Dumka, Kiev, 1973) [in Russian].
2. N. A. Shabanova and P. D. Sarkisov, Foundations of SolGel Technology of Nanodisperse Silica (IKTs Akademkniga, Moscow, 2004) [in Russian].
3. N. O. Zulumyan, A. R. Isaakyan, and Z. G. Oganesyan, Zh. Prikl. Khim. 80, 1045 (2007) [Russ. J. Appl. Chem. 80, 1020 (2007)].
4. N. O. Zulumyan, A. R. Isaakyan, G. G. Grigoryan, and G. R. Ogannisyan, in Proc. of the 18th Mendeleev Symp. on General and Applied Chemistry, Sept. 23–28, 2007, p. 263.
5. V. V. Strelko, T. I. Burushkina, and V. N. Belyakov, Dokl. Akad. Nauk SSSR 215, 606 (1974).