?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Donna&rft.au=Hirst%2C+Donna&rft.aulast=Hirst&rft.title=Planning+and+Implementing+ALEPH+System+Purges%3A+Purging+Acquisitions+Data&rft.date=6+June+2005&rft.genre=proceeding