Antiprotozoal effect of crude extracts and flavonoids isolated from Chromolaena hirsuta (Asteraceae) - Contini, Sílvia Helena Taleb; Salvador, Marcos José; Balanco, José Mário de Freitas; Albuquerque, Sérgio de; Oliveira, Dionéia Camilo Rodrigues de (Phytotherapy Research, 2004)