@misc{indiciae28b36a208b12,
  title = {Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements},
  author = {J.K. Bohlke and Tyler B. Coplen},
  year = {1995},
  url = {https://pubs.usgs.gov/publication/70188273},
  note = {Source identifier: 70188273}
}