Chien Chin Chen Yao-Tsung Chen Yeali S. Sun Meng Chang Chen Life Cycle Modeling of News Events Using Aging Theory. 47-59 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2837&spage=47 2003 conf/ecml/2003 ECML db/conf/ecml/ecml2003.html#ChenCSC03