@inproceedings{sgem2015s20034,
  title = {ENERGY EFFICIENCY EVALUATION OF COAL PRODUCTION},
  author = {Pikon, Krzysztof and Bogacka, Magdalena and Stanek, Wojciech and Czarnowska, Lucyna},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION},
  year = {2015},
  pages = {259-266},
  publisher = {Stef92 Technology},
  doi = {10.5593/sgem2015/b51/s20.034}
}