@misc{indiciae1d98238bedc0,
  title = {Improved screening method for beta-blockers in urine using solid-phase extraction and capillary gas chromatography-mass spectrometry.},
  author = {M S Leloux and E G de Jong and R A Maes},
  year = {1989},
  doi = {10.1016/s0378-4347(00)82960-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2568364/},
  note = {Source identifier: 2568364}
}