Lengyel, Imre, and Balázs Kotosz. “The Catching up Processes of the Regions of the Visegrad Group Countries”. Comparative Economic Research. Central and Eastern Europe 21, no. 4 (December 10, 2018): 5–24. Accessed January 25, 2026. https://www.czasopisma.uni.lodz.pl/CER/article/view/3877.