Warżała, Rafał. “Synchronisation of Regional Business Cycles of Eastern Polish Provinces With the National Cycle in the Context of Regional Economic Structures”. Olsztyn Economic Journal 10, no. 2 (June 30, 2015): 157–171. Accessed June 23, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3144.