Ratner, Svetlana, Yuri Chepurko, Larisa Drobyshecskaya, and Anna Petrovskaya. 2018. “Management of Energy Enterprises: Energy-Efficiency Approach in Solar Collectors Industry: The Case of Russia”. International Journal of Energy Economics and Policy 8 (4):237-43. https://mail.econjournals.com/index.php/ijeep/article/view/6740.