pdf dblp Mercure at trec9: Web and Filtering tasks M. Abchiche | Mohand Boughanem | Taoufiq Dkaki | Josiane Mothe | Chantal Soulé-Dupuy | Mohamed Tmar Proceedings of The Ninth Text REtrieval Conference, TREC 2000, Gaithersburg, Maryland, USA, November 13-16, 2000