Mao Chen Andrea S. LaPaugh Jaswinder Pal Singh Content Distribution for Publish/Subscribe Services. 83-102 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2672&spage=83 2003 conf/middleware/2003 Middleware db/conf/middleware/middleware2003.html#ChenLS03