@inproceedings{sgem2018s03119,
  title = {THE EXPLOITATION OF THE HARD COAL OF THE JIU VALLEY COALFIELD IN TERMS OF PROFITABILITY, ON THE CONCEPTS OF ENERGY SECURITY AND SOCIAL SECURITY},
  author = {Cristian Tomescu},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Mining},
  year = {2018},
  pages = {941-948},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2018/1.3/s03.119}
}