@misc{indiciaef50ab34c61b6,
  title = {Determination of palladium, platinum and rhodium in geologic materials by fire assay and emission spectrography},
  author = {J. Hapfty and L.B. Riley},
  year = {1968},
  doi = {10.1016/0039-9140(68)80014-1},
  url = {https://pubs.usgs.gov/publication/70011497},
  note = {Source identifier: 70011497}
}