Metodi Ivanov. "PROBLEMS IN THE REACTION OF THE REGIONAL ECONOMY DURING THE PANDEMIC COVID -19 IN THE REPUBLIC OF BULGARIA." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation (2021): 479-486. https://doi.org/10.5593/sgem2021/5.1/s21.101