Samarina, Vera, Tatiana Skufina, Аlexander Samarin, and Denis Ushakov. 2018. “Alternative Energy Sources: Opportunities, Experience and Prospects of the Russian Regions in the Context of Global Trends”. International Journal of Energy Economics and Policy 8 (2):140-47. https://econjournals.com/index.php/ijeep/article/view/6273.