@misc{indiciae98412d203d41,
  title = {Colorimetric determination of nitrate plus nitrite in water by enzymatic reduction, automated discrete analyzer methods},
  author = {Charles J. Patton and Jennifer R. Kryskalla},
  year = {2011},
  doi = {10.3133/tm5b8},
  url = {https://pubs.usgs.gov/publication/tm5B8},
  note = {Source identifier: tm5B8}
}