@misc{indiciae6b347bd0008b,
  title = {Preliminary results from the Viking x-ray fluorescence experiment: The first sample from Chryse Planitia, Mars},
  author = {P. Toulmin and B. C. Clark and A. K. Baird and Klaus Keil and H. J. Rose},
  year = {1976},
  doi = {10.1126/science.194.4260.81},
  url = {https://pubs.usgs.gov/publication/70011000},
  note = {Source identifier: 70011000}
}