Powered by STEF92 Technology Ltd. OMV - Offshore Exploration - General Sponsor of SGEM Ministry of Ecology and Environmental Protection - Honoured Organizer of SGEM "STEF92 Technology" Ltd., Bulgaria University of Mining and Geology "St. Ivan Rilsky", Bulgaria Istanbul University, Engineering Faculty, Turkey Sofia University "St. Kliment Ohridski", Faculty of Mathematics and Computer Science, Bulgaria Beykent University, Turkey University of Architecture, Civil Engineering and Geodesy, Faculty of Geodesy, Bulgaria