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104Capillary gas chromatographic method for mandelic and phenylglyoxylic acids in urine, International Archives of Occupational and Environmental Health Gas-chromatographisch-massenspektrometrische Bestimmung von Patulin in Apfelerzeugnissen, Fresenius' Zeitschrift f??r analytische Chemie A Novel Derivatization Method Coupled with GCu2013MS for the Simultaneous Determination of Chloropropanols, Chromatographia Sequential extraction of amphetamines, opiates, and 11-nor-??9-tetrahydrocannabinol-9-carboxylic acid from a limited volume of urine using a monolithic silica spin column coupled with gas chromatographyu2013mass spectrometry, Forensic Toxicology Rapid Determination of Salicylic Acid in Plant Materials by Gas Chromatographyu2013Mass Spectrometry, Chromatographia