@proceedings{sgem2011v1,
  title = {11th International Multidisciplinary Scientific GeoConference SGEM 2011, Conference Proceedings, Vol. 11, Volume 1},
  author = {International authors},
  year = {2011},
  publisher = {STEF92 Technology},
  isbn = {},
  doi = {10.5593/sgem2011/v1}
}