?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Margery&rft.aulast=Tibbetts&rft.au=Tibbetts%2C+Margery&rft.title=Why+isn't+full+text+found%3F+Analysis+of+SFX+statistics+report+20&rft.date=6+June+2007&rft.genre=proceeding