@inproceedings{sgem2021s05094,
  title = {LOCAL SPECTRAL CHARACTHERISTICS OF ULTRA LOW FREQUENCY GEOMAGNETIC VARIATIONS WITH MODERATE GEOMAGNETIC ACTIVITY CONDITIONS AT MID LATITUDES},
  author = {B. Andonov and Maria Chamati},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Science and Technologies in Geology, Exploration And Mining},
  year = {2021},
  pages = {519-526},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/1.1/s05.094}
}