@misc{indiciae97aea50a3cbd,
  title = {The characterization of USGS gold reference standard, DGPM-1},
  author = {D. J. Grimes and K. C. Stewart and S. A. Wilson and E.L. Kretschmer},
  year = {1996},
  doi = {10.3133/ofr9658},
  url = {https://pubs.usgs.gov/publication/ofr9658},
  note = {Source identifier: ofr9658}
}