Strielkowski, Wadim, and Felix Höschle. “Evidence for Economic Convergence in the EU: The Analysis of past EU Enlargements”. Technological and Economic Development of Economy 22, no. 4 (June 27, 2016): 617-630. Accessed April 20, 2024. https://journals.vilniustech.lt/index.php/TEDE/article/view/743.