?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Baltazar%2C+Pedro&rft.aulast=Baltazar&rft.aufirst=Pedro&rft.title=Typing+dynamic+roles+in+multiparty+interaction&rft.date=September+2011&rft.genre=proceeding