Sergey Chernov Gianluca Demartini Julien Gaugaz L3S Research Center at TREC 2006 Enterprise Track. 2006 TREC http://trec.nist.gov/pubs/trec15/papers/l3s.ent.final.pdf conf/trec/2006 db/conf/trec/trec2006.html#ChernovDG06