@misc{indiciae7ba29272e39d,
  title = {Routine determination of sulfonylurea, imidazolinone, and sulfonamide herbicides at nanogram-per-liter concentrations by solid-phase extraction and liquid chromatography/mass spectrometry},
  author = {E. T. Furlong and M.R. Burkhardt and Paul M. Gates and S.L. Werner and W.A. Battaglin},
  year = {2000},
  doi = {10.1016/s0048-9697(99)00537-9},
  url = {https://pubs.usgs.gov/publication/70022730},
  note = {Source identifier: 70022730}
}