@inproceedings{sgem2006paper,
  title = {TRACE ELEMENTS IN FLY ASHES FROM “VARNA”, “BOBOV DOL”, “MARITZA IZTOK I”, “MARITZA ІІІ”, „REPUBLIKA” AND “ROUSSE IZTOK” POWER PLANTS, BULGARIA},
  author = {A. Shoumkova and V. Stoyanova},
  booktitle = {6th International Scientific Conference - SGEM},
  year = {2006},
  pages = {349-358},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}