?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+Langer+Heinz&rft.aufirst=Heinz&rft.aulast=Langer&rft.title=Acta+scientiarum+mathematicarum&rft.atitle=On+measurable+Hermitian+indefinite+functions+with+a+finite+number+of+negative+squares&rft.pages=281-292&rft.date=1983&rft.volume=45&rft.issn=0001-6969&rft.genre=article