Borodin, Alex, Irina Mityushina, Mustafa Harputlu, Natalia Kiseleva, and Andrey Kulikov. “Factor Analysis of the Efficiency of Russian Oil and Gas Companies”. International Journal of Energy Economics and Policy 13, no. 1 (January 22, 2023): 172–188. Accessed December 27, 2024. https://mail.econjournals.com/index.php/ijeep/article/view/13763.