TY  - RPRT
TI  - Improved screening method for beta-blockers in urine using solid-phase extraction and capillary gas chromatography-mass spectrometry.
AU  - M S Leloux
AU  - E G de Jong
AU  - R A Maes
PY  - 1989
DO  - 10.1016/s0378-4347(00)82960-6
UR  - https://pubmed.ncbi.nlm.nih.gov/2568364/
ID  - 2568364
ER  -