@misc{indiciae2fdeebf94699,
  title = {Quality of Selected Hungarian Coals},
  author = {E.R. Landis and T.J. Rohrbacher and H.J. Gluskoter and B. Fodor and G. Gombar},
  year = {2007},
  doi = {10.3133/sir20065289},
  url = {https://pubs.usgs.gov/publication/sir20065289},
  note = {Source identifier: sir20065289}
}