BECK, Krzysztof. Determinants of Business Cycles Synchronization in the European Union and the Euro Area. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy. Online. 29 January 2014. Vol. 8, no. 4, pp. 25-48. [Accessed 27 April 2024]. DOI 10.12775/EQUIL.2013.025.