Guliev, Igbal А., et al. “The Prospects of Conventional and Alternative Energy Production in the Countries of the Balkan Peninsula (in the Context of Developing Economic Indicators)”. International Journal of Energy Economics and Policy, vol. 10, no. 1, Nov. 2019, pp. 481-7, https://econjournals.org.tr/index.php/ijeep/article/view/8290.