@misc{indiciae4c789730cf8a,
  title = {The group separation of the rare-earth elements and yttrium from geologic materials by cation-exchange chromatography},
  author = {J.G. Crock and F.E. Lichte and T.R. Wildeman},
  year = {1984},
  doi = {10.1016/0009-2541(84)90121-9},
  url = {https://pubs.usgs.gov/publication/70014010},
  note = {Source identifier: 70014010}
}