Zhifang Wang Qi Han Xiamu Niu Christoph Busch Feature-Level Fusion of Iris and Face for Personal Identification. 356-364 2009 ISNN (3) http://dx.doi.org/10.1007/978-3-642-01513-7_38 conf/isnn/2009-3 db/conf/isnn/isnn2009-3.html#WangHNB09