Lizunkov, V., E. Politsinskaya, E. Malushko, A. Kindaev, and M. Minin. “Population of the World and Regions As the Principal Energy Consumer”. International Journal of Energy Economics and Policy, vol. 8, no. 3, May 2018, pp. 250-7, https://www.econjournals.com/index.php/ijeep/article/view/6182.