Hurtado, F. B.; Lima, R. A.; Teixeira, L. F.; Silva, I. C.; Bay, M. B.; Azevedo, M. S.; Facundo, V. A. Antioxidant Activity and Characterization of the Essential Oil from the Roots of Piper Marginatum Jacq. CeN 2016, 38, 1504-1511.