Beck, Krzysztof. “Determinants of the Economic Cycle Synchronization in the European Union in the Years 1990–2007”. Gospodarka w Praktyce i Teorii 34, no. 1 (January 1, 2014): 5–20. Accessed December 6, 2025. https://czasopisma.uni.lodz.pl/gospodarka/article/view/20221.