"K.Takeshita,Yoichi Takashima,Shiro Matsumoto,Hiromitsu Yamanaka","Extraction of Cerium(III) by Polymer Gels Swollen with Bidentate Organophosphorus Compounds",,"J. Chem. Eng. Japan",,"Vol. 28","Issue 1","pp. 91-96",1995,Jan.