?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=K%C3%A1lm%C3%A1n&rft.aulast=Pal%C3%A1gyi&rft.au=+Pal%C3%A1gyi+K%C3%A1lm%C3%A1n&rft.issn=0324-721X&rft.pages=939-958&rft.volume=23&rft.atitle=How+sufficient+conditions+are+related+for+topology-preserving+reductions&rft.issue=3&rft.title=Acta+cybernetica&rft.date=2018&rft.genre=article