Zoya Mateeva. "CLIMATE CHANGE IN SOFIA." SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, 2022, pp. 309-316. https://doi.org/10.5593/sgem2022/4.1/s19.40