@misc{indiciaea97607302776,
  title = {Comparison of stable isotope reference samples},
  author = {Tyler B. Coplen and Carol Kendall and Jessica A. Hopple},
  year = {1983},
  doi = {10.1038/302236a0},
  url = {https://pubs.usgs.gov/publication/70204904},
  note = {Source identifier: 70204904}
}