@proceedings{sgem202121,
  title = {21st International Multidisciplinary Scientific GeoConference SGEM 2021, Geoinformatics, Remote Sensing, and Artificial Intelligence, Vol. 21, Issue 2.1},
  author = {International authors},
  year = {2021},
  publisher = {STEF92 Technology},
  isbn = {},
  doi = {10.5593/sgem2021/2.1}
}