@misc{indiciae1038e0468241,
  title = {Determination of total sulfur in lichens and plants by combustion-infrared analysis},
  author = {L. L. Jackson and E.E. Engleman and J. L. Peard},
  year = {2002},
  doi = {10.1021/es00135a009},
  url = {https://pubs.usgs.gov/publication/70013042},
  note = {Source identifier: 70013042}
}