Egyed, Ildikó, and Zsuzsanna Zsibók. “Exploring Firm Performance in Central and Eastern European Regions: A Foundational Approach”. Hungarian Geographical Bulletin 72, no. 3 (September 30, 2023): 257-285. Accessed January 8, 2025. https://ojs.mtak.hu/index.php/hungeobull/article/view/11603.