@misc{indiciae163696a5297d,
  title = {Isotopes matter},
  author = {Norman E. Holden and Tyler B. Coplen and Peter Mahaffy},
  year = {2019},
  doi = {10.1515/ci-2019-0107},
  url = {https://pubs.usgs.gov/publication/70202179},
  note = {Source identifier: 70202179}
}