@inproceedings{sgem2012s05v2004,
  title = {HYDROCARBON NON-ECONOMIC ACCUMULATIONS AND SHOWS IN THE SOUTHERN PART OF CENTRAL NORTH BULGARIA},
  author = {Botoucharov, Nikola},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference},
  year = {2012},
  pages = {457 - 462 pp},
  publisher = {Stef92 Technology},
  doi = {10.5593/sgem2012/s05.v2004}
}