@misc{indiciaeec7306cf69cc,
  title = {Rapid solid-phase extraction/derivatization system for sample preparation and gas chromatographic/mass spectrometric determination of drugs in human urine.},
  author = {S Cárdenas and M Gallego and M Valcárcel},
  year = {1997},
  doi = {10.1002/(sici)1097-0231(19970215)11:3<298::aid-rcm775>3.0.co;2-\#},
  url = {https://pubmed.ncbi.nlm.nih.gov/9077000/},
  note = {Source identifier: 9077000}
}