Heller, Janusz, and Marcin Bogdański. “Economic Growth in the Warmia and Mazury Voivodship Compared to Selected Countries and Regions of the European Union”. Olsztyn Economic Journal 9, no. 1 (March 31, 2014): 5–16. Accessed July 22, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3161.