@misc{indiciaea0d20e3212d4,
  title = {Mössbauer spectroscopic investigation of iron species in coal},
  author = {Gerard V. Smith and Juei-Ho Liu and Mykola Saporoschenko},
  year = {1978},
  doi = {10.1016/0016-2361(78)90089-3},
  url = {https://pubs.usgs.gov/publication/70012767},
  note = {Source identifier: 70012767}
}