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This year, like in 2006, we use a collection of about 160000 full-text articles. The proposed task is a passage retrieval task. Several measures are applied on the returned data: passage mean average precision, document mean average precision, aspect mean average precision. This year, our efforts concentrated on combining knowledge-driven methods on top of a standard vectorspace retrieval approach. We tested a passage selection methods based on vocabulary density estimation using severaldblp:conf/trec/GobeillTER07 fatcat:xikbtirdg5gxldyjijowzyxr3m