@misc{indiciaec285f729a72e,
  title = {Chemical sensors for volcanic gases with a compilation of commercial availability},
  author = {A. J. Sutton},
  year = {1990},
  doi = {10.3133/ofr9044},
  url = {https://pubs.usgs.gov/publication/ofr9044},
  note = {Source identifier: ofr9044}
}