@inproceedings{sgem2003paper,
  title = {OCCURRENCE AND EVOLUTION OF HEAVY METALS AND AS POLLUTION IN WATERS AND VEGETABLES IN PLOVDIV – ASSENOVGRAD AREA},
  author = {E. N. Pentcheva and N. Velitchkova and M. Karadjov},
  booktitle = {3rd International Scientific Conference - SGEM2003},
  year = {2003},
  pages = {295-304},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}