Enantioselective assay of nisoldipine in human plasma by chiral high-performance liquid chromatography combined with gas chromatographic-mass spectrometr: applications to pharmacokinetics - Marques, M. P.; Santos, Neife Aparecida Guinaim; Coelho, Eduardo Barbosa; Bonato, Pierina Sueli; Lanchote, Vera Lúcia (Journal of Chromatography B: Biomedical Sciences and Applications, 2001)