1. A. R. Regel’, ed., Thermoelectric Generators [in Russian] (Atomizdat, Moscow, 1976), p. 62.
2. N. Kh. Abrikosov and L. E. Shelimova, IV–VI Based Semiconductor Materials [in Russian] (Nauka, Moscow, 1975), p. 65.
3. L. L. Silin and Yu. B. Shubin, Fiz. Khim. Obrab. Mater. 5, 127 (1967).
4. M. A. Korzhuev, Germanium Telluride and Its Physical Properties [in Russian] (Nauka, Moscow, 1986).
5. O. A. Kazanskaya, B. A. Efimova, and L. E. Moskaleva, in Abstracts of the Sixth All-Union Conference on the Physicochemical Principles of Doping of Semiconductor Materials [in Russian] (Nauka, Moscow, 1988), p. 195.