@inproceedings{sgem2009paper,
  title = {ESTIMATION OF AIR POLLUTION CLIMATIC VALUES FOR BULGARIA},
  author = {D. Syrakov and M. Prodanova and N. Miloshev and K. Ganev and G. Jordanov and V. Spiridonov and A. Bogatchev},
  booktitle = {9th International Multidisciplinary Scientific GeoConference SGEM2009},
  year = {2009},
  pages = {313-320},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}