Shinkevich, Alexey I., et al. “Optimization of Energy-Efficient Functioning of the Oil and Gas Sector of the Economy through Digitalization and Resource Conservation”. International Journal of Energy Economics and Policy, vol. 11, no. 5, Aug. 2021, pp. 321-30, https://mail.econjournals.com/index.php/ijeep/article/view/11695.