Athman Bouguettaya Ahmed K. Elmagarmid Mourad Ouzzani Brahim Medjahed Database Middleware for Distributed Ontologies in State and Federal Family & Social Services. 2004 DG.O http://dgrc.org/dgo2004/disc/presentations/health/bouguettaya.pdf db/conf/dgo/dgo2004.html#BouguettayaEOM04