?url_ver=Z39.88-2004&rft_id=30358648&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+Kurusa+%C3%81rp%C3%A1d&rft.aufirst=%C3%81rp%C3%A1d&rft.aulast=Kurusa&rft.date=2018&rft.volume=60&rft.title=BEITRAGE+ZUR+ALGEBRA+UND+GEOMETRIE&rft.issn=0138-4821&rft.issue=2&rft.atitle=Euler%E2%80%99s+ratio-sum+formula+in+projective-metric+spaces&rft.pages=379-390&rft.genre=article