1. Otraslevoi standart OST 3-4888-80. Steklo opticheskoe bestsvetnoe. Sinteticheskii sostav (Industrial Standard 3-4888-80. Optical Colorless Glass: Synthetic Composition).
2. Otraslevoi standart OST 3-4391-81. Steklo opticheskoe bestsvetnoe serii 100. Sinteticheskii sostav (Industrial Standard 3-4391-81. Optical Glass of Series 100: Synthetic Composition).
3. Otraslevoi standart OST 3-1768-73. Steklo opticheskoe bestsvetnoe serii 200 i N. Sinteticheskii sostav (Industrial Standard 3-1768-73. Optical Glass of Series 200 and N: Synthetic Composition).
4. Arbuzov, V.I., Fundamental Absorption Spectra and Elementary Electronic Excitations in Oxide Glasses, Fiz. Khim. Stekla, 1996, vol. 22, no.6, pp. 665–682 [Glass Phys. Chem. (Engl. transl.), 1996, vol. 22, no. 6, pp. 477–489].
5. Raaben, E.L. and Tolstoi, M.N., Effect of the Nature of Glass-Former and Modifier on the Absorption Spectrum of Lead Ions, Fiz. Khim. Stekla, 1988, vol. 14, no.1, pp. 66–71.