@misc{indiciaed8a1f2b54725,
  title = {Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography},
  author = {M.R. Burkhardt and P.P. Soliven and S.L. Werner and D.G. Vaught},
  year = {2020},
  doi = {10.1093/jaoac/82.1.161},
  url = {https://pubs.usgs.gov/publication/70022012},
  note = {Source identifier: 70022012}
}