Karaev A, Ponkratov V, Masterov A, Kireeva E, Volkova M. Cross-country Analysis of the Comparative Efficiency of Government Support for Coal and Lignite Production. IJEEP [Internet]. 2020 Aug. 10 [cited 2024 Apr. 25];10(5):220-7. Available from: https://www.econjournals.com/index.php/ijeep/article/view/9550