@misc{indiciae2ca4ebec01c0,
  title = {A new organic reference material, L-glutamic acid, USGS41a, for δ 13 C and δ 15 N measurements − a replacement for USGS41},
  author = {Haiping Qi and Tyler B. Coplen and Stanley J. Mroczkowski and Willi A. Brand and Lauren Brandes and Heike Geilmann and Arndt Schimmelmann},
  year = {2016},
  doi = {10.1002/rcm.7510},
  url = {https://pubs.usgs.gov/publication/70177884},
  note = {Source identifier: 70177884}
}