Shun Bian Wenjia Wang Investigation on Diversity in Homogeneous and Heterogeneous Ensembles. 3078-3085 2006 IJCNN http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=36115&arnumber=1716517&count=787&index=455 conf/ijcnn/2006 db/conf/ijcnn/ijcnn2006.html#BianW06