@misc{indiciaefaffea59b62f,
  title = {New guidelines for δ 13 C measurements},
  author = {Tyler B. Coplen and Willi A. Brand and Matthias Gehre and Manfred Groning and Harro A. J. Meijer and Blaza Toman and R. Michael Verkouteren},
  year = {2006},
  doi = {10.1021/ac052027c},
  url = {https://pubs.usgs.gov/publication/70030633},
  note = {Source identifier: 70030633}
}