@inproceedings{sgem2021s1914,
  title = {RADON IN TOURIST CAVES IN BULGARIA, AS AIR POLLUTER AND EXPOSURE CONTROL},
  author = {Bistra Kunovska and Desislava Djunakova and Jana Djounova and Kremena Ivanova and Zdenka Stojanovska},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Energy and Clean Technologies},
  year = {2021},
  pages = {95-104},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021v/4.2/s19.14}
}