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2. V. V. Sobolev, Optical Properties and Electronic Structure of Nonmetals. I. Introduction to the Theory [in Russian], Inst. Komp. Issled., Moscow/Izhevsk (2012).
3. V. V. Sobolev, Properties and Electronic Structure of Nonmetals. II. Simulation of Integral Spectra by Elementary Bands [in Russian], Inst. Komp. Issled., Moscow/Izhevsk (2012).
4. T. S. Moss, Optical Properties of Semiconductors, Butterworths, London (1959).
5. V. V. Sobolev, Intrinsic Energy Levels of Group A 4 Solids [in Russian], Shtiintsa, Kishinev (1978).