@misc{indiciae070e5a13fab1,
  title = {Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements},
  author = {David W. Hoffman and Cornelia Rasmussen and Arndt Schimmelmann and Lauren T Reid and Haiping Qi and Tyler B. Coplen},
  year = {2026},
  doi = {10.1002/rcm.70132},
  url = {https://pubs.usgs.gov/publication/70277046},
  note = {Source identifier: 70277046}
}