@inproceedings{sgem2007paper,
  title = {ADVANTAGES OF GREY LEVEL PROCESSING APPLIED TO DIGITAL GRAPHIC IMAGES},
  author = {B. D. Marinov},
  booktitle = {7th International Scientific Conference - SGEM2007},
  year = {2007},
  pages = {},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}