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Chou, S.-L.; Yang, M.-H.; Ling, Y.-C.; Giang, Y.-S., Gas chromatography-isotope dilution mass spectrometry preceded by liquid-liquid extraction and chemical derivatization for the determination of ketamine and norketamine in urine, J. Chromatogr. B, 2004, 799, 1, 37-50, https://doi.org/10.1016/j.jchromb.2003.10.009 . [all data]