1. A. F. Ioffe, Physics of Semiconductors (Akad. Nauk SSSR, Moscow, 1957) [in Russian].
2. N. Kh. Abrikosov, V. F. Bankina, L. V. Poretskaya, et al., Semiconductor Chalcogenides and Alloys Based on Them (Nauka, Moscow, 1975) [in Russian].
3. Physicochemical Properties of Semiconductors, Ed. by L. V. Novoselova and V. B. Lazareva (Nauka, Moscow, 1979) [in Russian].
4. M. Kh. Balapakov, R. A. Yakshibaev, and U. Kh. Mukhammed’yanov, Fiz. Tverd. Tela 45, 604 (2003).
5. M. B. Babanly, Yu. A. Yusibov, and V. T. Abishev, Ternary Chalcogenides Based on Copper and Silver (BGU, Baku, 1993) [in Russian].