@misc{indiciaea1784ca3ea36,
  title = {Carbon and oxygen isotopic composition of coal and carbon dioxide derived from laboratory coal combustion: A preliminary study},
  author = {Peter D. Warwick and Leslie F. Ruppert},
  year = {2016},
  doi = {10.1016/j.coal.2016.06.009},
  url = {https://pubs.usgs.gov/publication/70184977},
  note = {Source identifier: 70184977}
}