@misc{indiciaebb851dfe42a9,
  title = {Determination of herbicides and their degradation products in surface waters by gas chromatography/positive chemical ionization/tandem mass spectrometry},
  author = {C.E. Rostad and W. E. Pereira and T.J. Leiker},
  year = {1989},
  doi = {10.1002/bms.1200180928},
  url = {https://pubs.usgs.gov/publication/70016443},
  note = {Source identifier: 70016443}
}