Yasuo Matsuyama Naoto Katsumata Ryo Kawamura Independent Component Analysis Minimizing Convex Divergence. 27-34 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2714&spage=27 2003 conf/icann/2003 ICANN db/conf/icann/icann2003.html#MatsuyamaKK03