@inproceedings{sgem2007paper,
  title = {VITRINITE REFLECTANCE - A MAJOR METHOD IN ANALYSIS OF MATURITY AND THERMAL HISTORY OF SEDIMENTS IN NORTH BULGARIA},
  author = {Nikola Botoucharov},
  booktitle = {7th International Scientific Conference - SGEM2007},
  year = {2007},
  pages = {},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}