Timour Katchaounov Tore Risch Simon Zürcher Object-Oriented Mediator Queries to Internet Search Engines. 176-186 2002 conf/oois/2002w OOIS Workshops http://link.springer.de/link/service/series/0558/bibs/2426/24260176.htm db/conf/oois/oois2002w.html#KatchaounovRZ02