9Bernd Jansen M D, Ph D. Chemical Modification of Polyu- rethanes by Radiation-induced Grafting[J]. Journal of Bio- material Application, 1986, 1: 502-532.
10Keiji Fujimoto, Hideki Tadokoro, Yohichi Ueda, Polyu- rethane Surface Modification by Graft Polymerization of Acrylamide for Reduced Protein Adsorption and Platelet Adhesion[J]. Biomaterials, 1993, 14(6): 442-448.