Turan Kurtaran, Ayten, et al. “A Model Suggestion for Determining the Values of Firms the Energy Sector: An Application in BIST Electricity Index”. International Journal of Energy Economics and Policy, vol. 11, no. 5, Aug. 2021, pp. 275-80, https://econjournals.com.tr/index.php/ijeep/article/view/11520.