Shun Bian Wenjia Wang On diversity and accuracy of homogeneous and heterogeneous ensembles. 103-128 2007 4 Int. J. Hybrid Intell. Syst. 2 http://iospress.metapress.com/openurl.asp?genre=article&issn=1448-5869&volume=4&issue=2&spage=103 db/journals/ijhis/ijhis4.html#BianW07