TY  - RPRT
TI  - 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.
AU  - Stefan Weigel
AU  - Roland Kallenborn
AU  - Heinrich Hühnerfuss
PY  - 2004
DO  - 10.1016/j.chroma.2003.10.036
UR  - https://pubmed.ncbi.nlm.nih.gov/14753684/
ID  - 14753684
ER  -