TY - CPAPER AU - Severina Djorova AU - Maria Nikolova TI - DETERMINATION OF DEPTH PARAMETERS OF SUBSURFACE VOIDS USING GRAVIMETRIC AND GLOBAL NAVIGATION SATELITTE SYSTEMS MEASUREMENTS T2 - 24th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2024, Science and Technologies in Geology, Exploration And Mining, Vol 24, Issue 1.1 PY - 2024 SP - 475 EP - 482 DO - 10.5593/sgem2024/1.1/s05.60 PB - STEF92 Technology ER -