?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Najmark&rft.aufirst=Mark+Aronovi%C4%8D&rft.au=+Najmark+Mark+Aronovi%C4%8D&rft.volume=24&rft.issn=0001-6969&rft.pages=177-189&rft.title=Acta+scientiarum+mathematicarum&rft.atitle=On+commuting+unitary+operators+in+spaces+with+indefinite+metric&rft.date=1963&rft.issue=3-4&rft.genre=article