Lu, Wenyun, Michelle F Clasquin, Eugene Melamud, Daniel Amador-Noguez, Amy A Caudy, and Joshua D Rabinowitz. (2010) 2010. “Metabolomic Analysis via Reversed-Phase Ion-Pairing Liquid Chromatography Coupled to a Stand Alone Orbitrap Mass Spectrometer.”. Anal Chem 82 (8): 3212-21. Reference Link