1. V. A. Romaka, P. Rogl, Yu. V. Stadnyk, L. P. Romaka, R. O. Korzh, D. Kaczorowski, V. Ya. Kraiovs’kii, and O. I. Lakh, Termoelektrika 2, 42 (2014).
2. B. I. Shklovskii and A. L. Efros, Electronic Properties of Doped Semiconductors (Springer, New York, 1984; Moscow, Nauka, 1979).
3. V. A. Romaka, P. Rogl, V. V. Romaka, D. Kaczorowski, Yu. V. Stadnyk, R. O. Korzh, V. Ya. Krayovskyy, and T. M. Kovbasyuk, Semiconductors 49, 290 (2015).
4. V. V. Romaka, E. K. Hlil, O. V. Bovgira, L. P. Romaka, V. M. Davidov, and R. V. Kraiovs’kii, Ukr. Fiz. Zh. 54, 1120 (2009).
5. L. I. Anatychuk, Termoelements and Thermoelectric Devices (Nauk. Dumka, Kiev, 1979) [in Russian].