“Evaluation of the Central Depressor Effects of the Ethanolic Extract of the Leaves of Synadenium Umbellatum Pax. And Its Fractions in Swiss Mice”. Revista Brasileira De Ciências Farmacêuticas, vol. 44, no. 3, Sept. 2008, pp. 485-91, https://doi.org/10.1590/S1516-93322008000300019.