Enantioselective analysis of metropolol in plasma using highperformance liquid chromatographic direct and indirect separations: aplications in pharmacokinetics - Lanchote, Vera Lúcia; Bonato, Pierina Sueli; Cerqueira, Paula Macedo; Pereira, Valéria Adriana; Cesarino, Evandro José (Journal of Chromatography B, 2000)