Emmanuela Neoma Akaniro-Ejim and Godwill Azeh Engwa 2018. Polyphenol Content and in Vitro Antioxidant Activity of Aqueous-Ethanol Extracts of Pterocarpus Soyauxii and Pterocarpus Santalinoides. Global Journal of Medical Research. 18, B2 (Mar. 2018), 1–8.