@misc{indiciaef7717d7524b5,
  title = {Emission spectrographic determination of trace elements in lunar samples},
  author = {C. Annell and A. Helz},
  year = {1970},
  doi = {10.1126/science.167.3918.52},
  url = {https://pubs.usgs.gov/publication/70010224},
  note = {Source identifier: 70010224}
}