@misc{indiciae40952ef36709,
  title = {Automated determination of total selenium in rocks, soils, and plants},
  author = {Paul H. Briggs and J.G. Crock},
  year = {1986},
  doi = {10.3133/ofr8640},
  url = {https://pubs.usgs.gov/publication/ofr8640},
  note = {Source identifier: ofr8640}
}