Godziszewski, Bartosz, Michał Kruszka, and Marcin Puziak. “Income Distribution and Regional Convergence in Poland and the European Union”. Olsztyn Economic Journal 8, no. 1 (March 31, 2013): 45–60. Accessed August 25, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3199.