?url_ver=Z39.88-2004&rft_id=2595933&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+Kurusa+%C3%81rp%C3%A1d&rft.aulast=Kurusa&rft.aufirst=%C3%81rp%C3%A1d&rft.issn=0047-2468&rft.atitle=Isoptic+characterization+of+spheres&rft.volume=106&rft.issue=1&rft.title=JOURNAL+OF+GEOMETRY&rft.date=2015&rft.pages=63-73&rft.genre=article