David A. Evans Gregory Grefenstette Yan Qu James G. Shanahan Victor Sheftel Agentized, Contextualized Filters for Information Management. 229-244 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2926&spage=229 2003 conf/amkm/2003 AMKM db/conf/amkm/amkm2003.html#EvansGQSS03