Cercel, Assit.Constantin, Grofu, Florin. "A SIMPLE MONITORING SOLUTION FOR LIGNITE MINING PIT." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference, 2012, pp. 1 - 8 pp. https://doi.org/10.5593/sgem2012/s10.v3001