@misc{indiciae078c1140b83d,
  title = {Multielement extraction system for the determination of 18 trace elements in geochemical samples},
  author = {J. R. Clark and J.G. Viets},
  year = {2002},
  doi = {10.1021/ac00224a017},
  url = {https://pubs.usgs.gov/publication/70011761},
  note = {Source identifier: 70011761}
}