SGEM 2016. 16th International Multidisciplinary Scientific GeoConference. Book 1. Science and Technologies in Geology, Exploration and Mining : conference proceedings. Albena, Bulgaria, 30 June - 6 July 2016. Volume III Hydrogeology, Engineering Geology & Geotechnics, Applied & Environmental Geophysics, Oil & Gas Exploration. 1. vyd. Sofia : STEF 92 Technology, 2016. 1034 s. ISBN 978-619-7105-57-5. ISSN 1314-2704.