Elena Hristova, Blagorodka Veleva. "ESTIMATION OF BLACK CARBON CONCENTRATION IN FINE PARTICULATE MATER IN URBAN AERA." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Energy and Clean Technologies (2020): 415-422. https://doi.org/10.5593/sgem2020/4.1/s19.052