@misc{indiciae74877331f55c,
  title = {Biotite as a source of some of the sulfur in porphyry copper deposits},
  author = {Norman G. Banks},
  year = {1973},
  doi = {10.2113/gsecongeo.68.5.697},
  url = {https://pubs.usgs.gov/publication/70241233},
  note = {Source identifier: 70241233}
}