Noriko Imafuji Yasui Xavier Llorà David E. Goldberg Yuichi Washida Hiroshi Tamura Key Elements Extraction in Online Collaborative Environments. 148-159 2007 ICEIS (Selected Papers) http://dx.doi.org/10.1007/978-3-540-88710-2_12 conf/iceis/2007sp db/conf/iceis/iceis2007sp.html#YasuiLGWT07a