Gulaliyev, Mayis Gulali, et al. “Consumer Surplus Changing in the Transition from State Natural Monopoly to the Competitive Market in the Electricity Sector in the Developing Countries: Azerbaijan Case”. International Journal of Energy Economics and Policy, vol. 10, no. 2, Jan. 2020, pp. 265-7, https://econjournals.com./index.php/ijeep/article/view/8909.