@misc{indiciae351020bfe1b2,
  title = {Reporting of nitrogen-isotope abundances (Technical Report)},
  author = {Tyler B. Coplen and H.R. Krouse and J.K. Bohlke},
  year = {2009},
  doi = {10.1351/pac199264060907},
  url = {https://pubs.usgs.gov/publication/70188276},
  note = {Source identifier: 70188276}
}