Petrov, Kamen. “Methodological Problems before Regional Development in the Conditions of Post COVID-19 Governance”. Journal of Geography, Politics and Society 11, no. 3 (November 29, 2021): 41–48. Accessed May 16, 2024. https://czasopisma.bg.ug.edu.pl/index.php/JGPS/article/view/6317.