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- [4] Determination of Ephedrine Alkaloids in Human Urine and Plasma by Liquid Chromatography/Tandem Mass Spectrometry: Collaborative Study Trujillo, W.A. (bill.trujillo@covance.com), 1600, AOAC International (86):
- [9] Determination of ephedra alkaloids by liquid chromatography/tandem mass spectrometry Sullivan, D. (darryl.sullivan@covance.com), 1600, AOAC International (86):