@inproceedings{sgem2021s20011,
  title = {CHEMICAL PECULIARITIES OF THE WATER RECOURSES IN THE UPPER PART OF OGOSTA RIVER CATCHMENTS, NORTHWESTERN BULGARIA},
  author = {Georgi Zhelezov},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation},
  year = {2021},
  pages = {43-50},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/5.1/s20.011}
}