Anticrotalic activity of the ethanolic extract from tabernaemontana catharinensis A.DC. and its fractions - Veronese, Elen L G; Cintra, Adélia Cristina Oliveira; Dias, Diones A; Pereira, Paulo S; França, Suzelei C; Sampaio, Suely Vilela (World Congress on Medicinal and Aromatic Plants for Human Welfare, 1997)