@misc{indiciae94716e226b47,
  title = {The Fraunhofer line discriminator: an airborne fluorometer},
  author = {George Eimert Stoertz},
  year = {1969},
  doi = {10.3133/ofr69272},
  url = {https://pubs.usgs.gov/publication/ofr69272},
  note = {Source identifier: ofr69272}
}