@misc{indiciaefd84ab6f2869,
  title = {Rare-earth elements in the Permian Phosphoria formation: Paleo proxies of ocean geochemistry},
  author = {D.Z. Piper and R.B. Perkins and H.D. Rowe},
  year = {2007},
  doi = {10.1016/j.dsr2.2007.04.012},
  url = {https://pubs.usgs.gov/publication/70031083},
  note = {Source identifier: 70031083}
}