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Savchuk, S.A.; Simonov, E.A.; Sorokin, V.I.; Dorogokupets, O.B.; Vedenin, A.N., Retention Time Locking in the Determination of Narcotic Drugs by Chromatography and Chromatography-Mass Spectrometry, J. Anal. Chem. USSR (Engl. Transl.), 2004, 59, 10, 954-964. [all data]