@inproceedings{sgem202111,
  title = {21st International Multidisciplinary Scientific GeoConference SGEM 2021, Science and Technologies in Geology, Exploration and Mining, Vol. 21, Issue 1.1},
  author = {International authors},
  booktitle = {International Multidisciplinary Scientific GeoConference SGEM 2021},
  year = {2021},
  pages = {},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/1.1}
}