@misc{indiciae46cdcbef72c0,
  title = {Determination of the oxidation state of uranium in apatite and phosphorite deposits},
  author = {R. S. Clarke and Z. S. Altschuler},
  year = {1958},
  doi = {10.1016/0016-7037(58)90044-9},
  url = {https://pubs.usgs.gov/publication/70010665},
  note = {Source identifier: 70010665}
}