SGEM SGEM 2015. 15th International Multidisciplinary Scientific GeoConference. Science and Technologies in Geology, Exploration and Mining : conference proceedings. Albena, Bulgaria, 18. - 24. 6. 2015 Volume II Hydrogeology, Engineering Geology and Geotechnics. -- 1. vyd. -- Sofia : STEF 92 Technology, 2015. -- 880 p. -- ISBN : 978-619-7105-32-2. -- ISSN : 1314-2704.