?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=L.&rft.aulast=Cordella&rft.au=+Cordella+L.&rft.title=A+restoration+technique+for+defocussed+biological+images&rft.date=1973&rft.genre=proceeding