2Dairoku Y, Yoshio F S, Yasuhiro A T. Water-absorbent resin, hydro-polymer, process for producing them, and uses of them[P], 美国: US 7091253, 2006 -08- 15.
3Dairoku Y, Yoshio F S, Yasuhiro A T. Water-Absorbent Resin, Hydro-Polymer, Process for Producing Them, and Uses of Them: US, 7091253 [P]. 2006 - 08 - 15.