Nguyen, Ngoc Thang, and Ha Thanh Ngo. “Extraction of Saponins from Vietnamese Soapnuts for Application to Washing Fabrics”. Engineering and Technology For Sustainable Development 31, no. 1 (March 15, 2021): 83–90. Accessed October 28, 2025. https://jst.vn/index.php/etsd/article/view/198.