@misc{indiciaed0d8e4151f65,
  title = {Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples distributed in September 2001},
  author = {Mark T. Woodworth and Brooke F. Connor},
  year = {2002},
  doi = {10.3133/ofr028},
  url = {https://pubs.usgs.gov/publication/ofr028},
  note = {Source identifier: ofr028}
}