?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Ji%C5%99%C3%AD&rft.aulast=Rach%C5%AFnek&rft.au=+Rach%C5%AFnek+Ji%C5%99%C3%AD&rft.pages=241-246&rft.issn=0001-6969&rft.date=1990&rft.title=Acta+scientiarum+mathematicarum&rft.issue=3-4&rft.volume=54&rft.atitle=A+characterization+of+o-distributive+semilattices&rft.genre=article