@misc{indiciaebeaee7ad0b16,
  title = {Results of the U. S. Geological Survey's analytical evaluation program for standard reference samples distributed in April 2001},
  author = {M.T. Woodworth and B.F. Connor},
  year = {2001},
  doi = {10.3133/ofr01287},
  url = {https://pubs.usgs.gov/publication/ofr01287},
  note = {Source identifier: ofr01287}
}