NONEVA-ZLATKOVA, Y.; ALEXANDROV, A. Analysis of Higher Education Policy Changes Due to COVID-19: The Case of Bulgaria. Balkans Journal of Emerging Trends in Social Sciences, Belgrade, Serbia, v. 4, n. 2, p. 91–99, 2021. DOI: 10.31410/Balkans.JETSS.2021.4.2.91-99. Disponível em: https://www.balkans-jetss.org/index.php/index_bjetss/article/view/69. Acesso em: 28 apr. 2025.