Samarina, V., T. Skufina, Аlexander Samarin, and D. Ushakov. “Alternative Energy Sources: Opportunities, Experience and Prospects of the Russian Regions in the Context of Global Trends”. International Journal of Energy Economics and Policy, vol. 8, no. 2, Mar. 2018, pp. 140-7, https://www.econjournals.com/index.php/ijeep/article/view/6273.