Dan-Dan, Hao, Chen Jian-Qiu, Liao Xin-Qiao, Zheng Yan, and Ji Yi-Bing. 2013. “Concentration of Astragalus Polysaccharide by Polysulfone-Activated Carbon Modified With Nitric Acid Blend Ultrafiltration Membranes”. Journal of Membrane and Separation Technology 2 (1):27-35. https://doi.org/10.6000/1929-6037.2013.02.01.3.