TY - CPAPER AU - International authors TI - 20th International Multidisciplinary Scientific GeoConference SGEM 2020, Energy and Clean Technologies, Vol. 20, Issue 4.2 T2 - International Multidisciplinary Scientific GeoConference SGEM 2020 PY - 2020 DO - 10.5593/sgem2020v/4.2 PB - STEF92 Technology ER -