@inproceedings{sgem2011v2,
  title = {11th International Multidisciplinary Scientific GeoConference SGEM 2011, Conference Proceedings, Vol. 11, Volume 2},
  author = {International authors},
  booktitle = {International Multidisciplinary Scientific GeoConference SGEM 2011},
  year = {2011},
  pages = {},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2011/v2}
}