Rigas, John, Giorgos Theodosiou, Nikolas Rigas, and George Blanas. 2017. “THE VALIDITY OF THE OKUN’S LAW: AN EMPIRICAL INVESTIGATION FOR THE GREEK ECONOMY”. Journal of European Economy 10 (1):16-38. https://jeej.wunu.edu.ua/index.php/enjee/article/view/440.