Shahbaz M, Dube S, Ozturk I, Jalil A. Testing the Environmental Kuznets Curve Hypothesis in Portugal. IJEEP [Internet]. 2015 Apr. 16 [cited 2025 Jun. 14];5(2):475-81. Available from: https://econjournals.net.tr/index.php/ijeep/article/view/1126