Kreydenko, Tatiana Fedorovna, Maxim Vasilyevich Chernyaev, and Elena Mikhaylovna Grigorieva. 2018. “Issues of Developing the Tool for Diagnosis of Energy Efficiency Level of Russian Regions’ Economy”. International Journal of Energy Economics and Policy 8 (4):187-98. https://econjournals.com/index.php/ijeep/article/view/6709.