Strušnik, Dušan, and Jurij Avsec. “ENERGO-ECONOMICS PAYBACK INVESTMENT CALCULATION MODELLING OF GAS-STEAM COMBINED CYCLE POWER PLANT”. Journal of Energy Technology, vol. 15, no. 4, Mar. 2023, pp. 11-28, https://doi.org/10.18690/jet.15.4.11-28.2022.