Tzviatka Karagiozova, Plamen Ninov. "RIVERS IN THE NATIONAL PARK RILA - HYDROLOGICAL ASSESSMENT." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Water Resources. Forest, Marine and Ocean Ecosystems (2020): 297-304. https://doi.org/10.5593/sgem2020/3.1/s12.039