Chernova, Elena Grigoryevna, and Svetlana Valerievna Razmanova. “Development of Competitive Environment in the Oil Market of Russian Federation: Empirical Analysis ”. Economy of Regions 14, no. 2 (May 29, 2018): 547–561. Accessed May 15, 2026. https://economyofregions.org/ojs/index.php/er/article/view/1986.