Majewska, Justyna, and Szymon Truskolaski. “Spatial Concentration of Economic Activity and Competitiveness of Central European Regions”. International Entrepreneurship Review 3, no. 1 (February 10, 2017): 47–64. Accessed May 4, 2024. https://ier.uek.krakow.pl/pm/article/view/1234.