Saiymova, M., N. Baikadamov, Y. Tyurina, G. Kutsuri, L. Sanginova, and M. Troyanskaya. “Russia’s Petroleum Industry in the Period of Sanctions and COVID-19 Pandemic: A Review and Analysis”. International Journal of Energy Economics and Policy, vol. 11, no. 5, Aug. 2021, pp. 483-9, https://www.econjournals.com/index.php/ijeep/article/view/11385.