@inproceedings{sgem2009paper,
  title = {BIOGAS PRODUCTION AS AN ENVIRONMENTALLY-FRIENDLY RENEWABLE ENERGY SOURCE},
  author = {E. Pehlivan},
  booktitle = {9th International Multidisciplinary Scientific GeoConference SGEM2009},
  year = {2009},
  pages = {373-382},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}