1. 1. Gregg S.J., Sing K.S.W. Adsorption, Surface Area and Porosity. 2nd ed. (London: Academic Press, 1982).
2. 2. Adamson A.W., Gast A.P. Physical Chemistry of Surface. 6th ed. (New York: Wiley, 1997).
3. 3. Iler R.K. The Chemistry of Silica. (Chichester: Wiley, 1979).
4. 4. Legrand A.P. The Surface Properties of Silicas. (New York: Wiley, 1998).
5. 5. Bergna H.E., Roberts W.O. Colloidal Silica: Fundamentals and Applications. (Boca Raton: CRC Press, 2006).