@misc{indiciae74cdd54cb03f,
  title = {Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group—Determination of glyphosate, aminomethylphosphonic acid, and glufonsinate in water using online solid-phase extraction and high-performance liquid chromatography/mass spectrometry},
  author = {E.A. Lee and A.P. Strahan and E.M. Thurman},
  year = {2001},
  doi = {10.3133/ofr01454},
  url = {https://pubs.usgs.gov/publication/ofr01454},
  note = {Source identifier: ofr01454}
}