Kapitonov, Ivan A., Irina V. Zhukovskaya, Rustem R. Khusaenov, and Valentin A. Monakhov. 2018. “Competitiveness and Competitive Advantages of Enterprises in the Energy Sector”. International Journal of Energy Economics and Policy 8 (5):300-305. https://mail.econjournals.com/index.php/ijeep/article/view/6705.