@inproceedings{sgem2011s03120,
  title = {IMPROVEMENT OF ECONOMIC EFFICIENCY OF LONGWALL MINING, IN SHORT PANELS, IN THE CASE OF JIU VALLEY THICK COAL SEAMS},
  author = {Ilie Onica},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference},
  year = {2011},
  pages = {},
  publisher = {Stef92 Technology},
  doi = {10.5593/sgem2011/s03.120}
}