1. Syrbu, N.N., Stamov, I.G., Kamertsel, A.I.: Sov. Phys. Semicond. 26, 7,665, Original Russian Text published in Fizica i Tekhnica Poluprovodnikov, 26 (1992), pp. 1191–1224 (1992)
2. Bodnari, I.V., Osipova, M.A., Rud, V.Yu., Rud, Yu.V., Bairamov, B.Kh.: J. Appl. Spectro. 77(1), 146–151 (2010)
3. Stamov, I.G., Tkacenco, D.V.: Semiconductors, 42(6), 662 (2008), Original Russian Text, published in “Fizica I Tekhnica Poluprovodnikov”, 42(6), 679–685 (2008)
4. Patscun, I.I., Sliukhina, I.A.: Semiconductor Physics, Quantum Electronics and Optoelectronics 7, 31–35 (2005)
5. Stamov, I.G., Syrbu, N.N., Dorogan, A.V.: Phys. B 412, 130–137 (2013)