Ecer, Fatih, and Sarfaraz Hashemkhani Zolfani. “Evaluating Economic Freedom via a Multi-Criteria MEREC-DNMA Model-Based Composite System: Case of OPEC Countries”. Technological and Economic Development of Economy 28, no. 4 (July 15, 2022): 1158–1181. Accessed October 5, 2022. https://journals.vilniustech.lt/index.php/TEDE/article/view/17152.