pdf dblp Experiments on the TREC-9 Filtering Track Keiichiro Hoashi | Kazunori Matsumoto | Naomi Inoue | Kazuo Hashimoto | Takashi Hasegawa | Katsuhiko Shirai Proceedings of The Ninth Text REtrieval Conference, TREC 2000, Gaithersburg, Maryland, USA, November 13-16, 2000