Porzucek, Slawomir. MICROGRAVITY SURVEY IN THE AREA OF THE FORMER SHALLOW COAL MINING. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2013, pp. 823 - 830 pp. https://doi.org/10.5593/sgem2013/ba1.v2/s05.019