Quantification of methyldopa in human plasma by high-performance liquid chromatography-electrospray tandem mass spectrometry application to a bioequivalence study - Oliveira, Celso H.; Barrientos-Astigarraga, Rafael E.; Sucupira, Mauro; Graudenz, Gustavo Silveira; Muscará, Marcelo Nicolás; De Nucci, Gilberto (Journal of Chromatography B, 2002)