@misc{indiciaefc7ed30f946a,
  title = {Improved online δ18O measurements of nitrogen‐ and sulfur‐bearing organic materials and a proposed analytical protocol},
  author = {Haiping Qi and Tyler B. Coplen and Leonard I Wassenaar},
  year = {2011},
  doi = {10.1002/rcm.5088},
  url = {https://pubs.usgs.gov/publication/70212846},
  note = {Source identifier: 70212846}
}