@inproceedings{sgem2009paper,
  title = {CALCRETE IN SOUTHEAST BULGARIA – A STUDY IN PROGRESS},
  author = {I. Dimitrov and M. Panayotova and D. Sachkov},
  booktitle = {9th International Multidisciplinary Scientific GeoConference SGEM2009},
  year = {2009},
  pages = {},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}