Quantification of benzoic, phenylacetic, and phenylbutyric acids from filter-paper blood spots by gas chromatography-mass spectrometry with stable isotope dilution
Xl. Yu et al., Quantification of benzoic, phenylacetic, and phenylbutyric acids from filter-paper blood spots by gas chromatography-mass spectrometry with stable isotope dilution, CLIN CHEM, 47(2), 2001, pp. 351-354