@misc{indiciaea98acde11b52,
  title = {Zirconium and hafnium},
  author = {James V. Jones and Nadine M. Piatak and George M. Bedinger},
  year = {2017},
  doi = {10.3133/pp1802v},
  url = {https://pubs.usgs.gov/publication/pp1802V},
  note = {Source identifier: pp1802V}
}