Karaev, Alan, Vadim Ponkratov, Andrey Masterov, Elena Kireeva, and Maria Volkova. “Cross-Country Analysis of the Comparative Efficiency of Government Support for Coal and Lignite Production”. International Journal of Energy Economics and Policy 10, no. 5 (August 10, 2020): 220–227. Accessed December 23, 2024. https://mail.econjournals.com/index.php/ijeep/article/view/9550.