In vitro schistosomicidal effects of aqueous and dichloromethane fractions from leaves and stems of Piper species and the isolation of an active amide from P. amalago L. (Piperaceae) - Carrara, V S; Vieira, S C; de Paula, R G; Rodrigues, V; Magalhães, L G; Cortez, D A; da Silva Filho, A A (J Helminthol, 2013)