George Barreto Bezerra Leandro Nunes de Castro Fernando J. Von Zuben A Hierarchical Immune Network Applied to Gene Expression Data. 14-27 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3239&spage=14 2004 conf/icaris/2004 ICARIS db/conf/icaris/icaris2004.html#BezerraCZ04