?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Pogorui%2C+A.+A.&rft.aulast=Pogorui&rft.aufirst=A.+A.&rft.issue=2&rft.volume=43&rft.date=1991&rft.atitle=Limit-ill-posed+equations+in+a+Hilbert+space&rft.title=Ukrainskii+Matematicheskii+Zhurnal&rft.pages=241-247&rft.genre=article