@inproceedings{sgem2011s20133,
  title = {GEOPARK BELOGRADCHIK ROCKS - PRIORITY OF THE BULGARIAN GEOCONSERVATION},
  author = {Dimitar Sinnyovsky},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference},
  year = {2011},
  pages = {},
  publisher = {Stef92 Technology},
  doi = {10.5593/sgem2011/s20.133}
}