@misc{indiciaec31d8f6853b1,
  title = {Composition and origin of coalbed gases in the Lower Silesian basin, southwest Poland},
  author = {M.J. Kotarba and D. D. Rice},
  year = {2001},
  doi = {10.1016/s0883-2927(00)00058-5},
  url = {https://pubs.usgs.gov/publication/70023336},
  note = {Source identifier: 70023336}
}