@misc{indiciae054e9af531e5,
  title = {Trends in tungsten, molybdenum, and cobalt production and trade in China},
  author = {Pui-Kwan Tse},
  year = {2003},
  doi = {10.3133/ofr0363},
  url = {https://pubs.usgs.gov/publication/ofr0363},
  note = {Source identifier: ofr0363}
}