@misc{indiciae9a77ecb71a13,
  title = {Mineral commodity profiles: Germanium},
  author = {W. C. Butterman and John D. Jorgenson},
  year = {2005},
  doi = {10.3133/ofr20041218},
  url = {https://pubs.usgs.gov/publication/ofr20041218},
  note = {Source identifier: ofr20041218}
}