@misc{indiciae5c3536336756,
  title = {Simultaneous solid-phase extraction of acidic, neutral and basic pharmaceuticals from aqueous samples at ambient (neutral) pH and their determination by gas chromatography-mass spectrometry.},
  author = {Stefan Weigel and Roland Kallenborn and Heinrich Hühnerfuss},
  year = {2004},
  doi = {10.1016/j.chroma.2003.10.036},
  url = {https://pubmed.ncbi.nlm.nih.gov/14753684/},
  note = {Source identifier: 14753684}
}