Mihaylov, Valentin. “Bulgaria’s Geopolitical and Geoeconomic Reorientation (1989–2019)”. Journal of Geography, Politics and Society 9, no. 4 (December 31, 2019): 12–23. Accessed April 20, 2024. https://czasopisma.bg.ug.edu.pl/index.php/JGPS/article/view/3901.