International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM = Conference proceedings. 17th International Multidisciplinary Scientific Geoconference SGEM 2017. Sofia : STEF92 Technology Ltd., 2017. 1 130 p. Dostupné na: https://doi.org/10.5593/sgem2017/52. ISSN 1314-2704