@misc{indiciae793607be4241,
  title = {Supervolcanoes and metallic ore deposits},
  author = {D. A. John},
  year = {2008},
  doi = {10.2113/gselements.4.1.22},
  url = {https://pubs.usgs.gov/publication/70033401},
  note = {Source identifier: 70033401}
}