1. Z. U. BORISOVA, “Khimiya stekloobraznyh poluprovodnikov” (LGU, Leningrad, 1972).
2. G. ROUSON, “Neorganicheskie stekloobrazuyushie sistemi” (MIR, Moscow, 1970).
3. D. M. PETROVIĆ, V. V. KHIMINETS, M. J. AVRAMOV and S. R. LUKIĆ,Rev. Res. Fac. Sci. Univ. Novi Sad 13 (1983) 1.
4. D. M. PETROVIĆ, V. V. KHIMINETS and M. J. AVRAMOV,Phys. Status Solidi (a) 89 (1985) 733.
5. K. NAKAMOTO, “Infrared Spectra of Inorganic and Coordination Compounds” (Wiley-Interscience, New York, 1970).