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König, Stefan; Aebi, Beat; Lanz, Stephan; Gasser, Martina; Weinmann, Wolfgang (2011). On-line SPE LC-MS/MS for the quantification of Δ9-tetrahydrocannabinol (THC) and its two major metabolites in human peripheral blood by liquid chromatography tandem mass spectrometry. Analytical and bioanalytical chemistry, 400(1), pp. 9-16. Heidelberg: Springer-Verlag 10.1007/s00216-011-4708-x
