@misc{indiciae72186013b9fc,
  title = {An exploration in mineral supply chain mapping using tantalum as an example},
  author = {Yadira Soto-Viruet and W. David Menzie and John F. Papp and Thomas R. Yager},
  year = {2013},
  doi = {10.3133/ofr20131239},
  url = {https://pubs.usgs.gov/publication/ofr20131239},
  note = {Source identifier: ofr20131239}
}