?url_ver=Z39.88-2004&rft_id=10.1209%2F0295-5075%2F81%2F28006&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Capocci&rft.au=Capocci%2C+Andrea&rft.aufirst=Andrea&rft.title=EPL+(Europhysics+Letters)&rft.issue=2&rft.volume=81&rft.date=January+2008&rft.atitle=Taxonomy+and+clustering+in+collaborative+systems%3A+the+case+of+the+on-line+encyclopedia+Wikipedia&rft.pages=28006&rft.issn=0295-5075+&rft.genre=article