Nikolay Botusharov (2012). HYDROCARBON NON-ECONOMIC ACCUMULATIONS AND SHOWS IN THE SOUTHERN PART OF CENTRAL NORTH BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference. https://doi.org/10.5593/sgem2012/s05.v2004