?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.compeleceng.2013.04.024&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Ullah%2C+R.&rft.aufirst=R.&rft.aulast=Ullah&rft.volume=39&rft.date=2013&rft.atitle=Dual-purpose+semi-fragile+watermark%3A+Authentication+and+recovery+of+digital+images&rft.title=Computers+and+Electrical+Engineering&rft.issn=00457906&rft.issue=7&rft.pages=2019-2030&rft.genre=article