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Determination of verapamil and norverapamil in human plasma by liquid chromatography: comparison between a liquid-liquid extraction procedure and an automated liquid-solid extraction method for sample preparation.
Hubert PH, Chiap P, Ceccato A, Bechet I, Sibenaler-Dechamps R, Maes P, Crommen J. Hubert PH, et al. Among authors: sibenaler dechamps r. J Pharm Biomed Anal. 1992 Oct-Dec;10(10-12):937-42. doi: 10.1016/0731-7085(91)80102-f. J Pharm Biomed Anal. 1992. PMID: 1298400