Сhernyaev, Maxim, et al. “Methodology of the Process of Improving the Support Tools for Fuel and Energy Complex Within the Context of Achieving Energy Efficiency and Energy Independence of the Region”. International Journal of Energy Economics and Policy, vol. 9, no. 1, Dec. 2018, pp. 250-61, https://econjournals.com.tr/index.php/ijeep/article/view/6970.