?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Betsy&rft.aulast=Friesen&rft.au=Friesen%2C+Betsy&rft.title=Upgrading+ALEPH+from+16+(or+17%3F)+to+18&rft.date=6+June+2007&rft.genre=proceeding