Kapitonov, I. A., V. I. Voloshin, I. V. Zhukovskaya, and A. A. Shulus. “Small and Medium-Sized Enterprises As a Driver of Innovative Development of the Russian Fuel and Energy Complex”. International Journal of Energy Economics and Policy, vol. 7, no. 3, July 2017, pp. 231-9, https://econjournals.com/index.php/ijeep/article/view/4526.