@inproceedings{sgem2007paper,
  title = {ENVIRONMENTAL BENCHMARKING AND BENEFIT OF PERFORMANCE BENCHMARKING},
  author = {L. Liberkova and I. Liberko},
  booktitle = {7th International Scientific Conference - SGEM2007},
  year = {2007},
  pages = {},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}