Determination of 'beta'-artemether and its main metabolite dihydroartemisinin in plasma employing liquid-phase microextraction prior to liquid chromatographic-tandem mass spectrometric analysis - Magalhães, Igor R. S.; Jabor, Valquíria Aparecida Polisel; Faria, Anizio M.; Collins, Carol H.; Jardim, Isabel C. S. F.; Bonato, Pierina Sueli (Talanta, 2010)