1. L. I. Anatychuk and L. N. Vikhor, Thermoelectricity, Vol. 4: Functional-Graded Thermoelectric Materials (Institute of Thermoelectricity Kiev, 2012), pp. 111–117 [in Russian].
2. G. A. Ivanov, V. A. Kulikov, V. L. Naletov, A. F. Panarin, and A. R. Regel’, Sov. Phys. Semicond. 6, 1134 (1972).
3. V. S. Zemskov, A. D. Belaya, and P. G. Borodin, Neorg. Mater. 18 (7), 1154 (1982).
4. V. S. Zemskov, A. D. Belaya, S. A. Zayakin, and N. A. Bulatova, Neorg. Mater. 23 (4), 554 (1987).
5. O. I. Markov, Tech. Phys. 50 (2), 202 (2005).