@misc{indiciaeda33cf9308db,
  title = {The determination of forty two elements in geological materials by inductively coupled plasma-mass spectrometry},
  author = {Paul H. Briggs and A. L. Meier},
  year = {1999},
  doi = {10.3133/ofr99166},
  url = {https://pubs.usgs.gov/publication/ofr99166},
  note = {Source identifier: ofr99166}
}