@misc{indiciaecb85e35145e2,
  title = {Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples distributed in September 2002},
  author = {Mark T. Woodworth and Brooke F. Connor},
  year = {2003},
  doi = {10.3133/ofr02481},
  url = {https://pubs.usgs.gov/publication/ofr02481},
  note = {Source identifier: ofr02481}
}