@misc{indiciae3a877a7c05cc,
  title = {Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Evaluation of alkaline persulfate digestion as an alternative to Kjeldahl digestion for determination of total and dissolved nitrogen and phosphorus in water},
  author = {Charles J. Patton and Jennifer R. Kryskalla},
  year = {2003},
  doi = {10.3133/wri034174},
  url = {https://pubs.usgs.gov/publication/wri034174},
  note = {Source identifier: wri034174}
}