B. Durmuşoğlu, A. A. Selam, and S. Ümit O. Fırat, “A Comparative Study on the Relations among Sustainability Focused Indexes with REC, CO2, and GDP”, ASRJETS-Journal, vol. 34, no. 1, pp. 81–94, Aug. 2017, Accessed: Sep. 11, 2025. [Online]. Available: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/3134