Magera MJ, Thompson AL, Matern D, Rinaldo P (mai 2003). „Liquid chromatography-tandem mass spectrometry method for the determination of vanillylmandelic acid in urine”. Clin. Chem. 49 (5): 825–6. doi:10.1373/49.5.825. PMID12709381.
Magera MJ, Thompson AL, Matern D, Rinaldo P (mai 2003). „Liquid chromatography-tandem mass spectrometry method for the determination of vanillylmandelic acid in urine”. Clin. Chem. 49 (5): 825–6. doi:10.1373/49.5.825. PMID12709381.