Ahmed et al. 2014. Polarity of extracts and fractions of four Combretum (Combretaceae) species used to treat infections and gastrointestinal disorders in southern African traditional medicine. Journal of Ethnopharmacology 154: 339–350.
http://pza.sanbi.org/references/ahmed-et-al-2014-polarity-extracts-and-fractions-four-combretum-combretaceae-species-used