pid type title authors mentors source_title published_date url doi isbn issn eissn rgn:2468 "journal article" "A Complete Quadrilateral in Rectangular Coordinates" "Volenec, Vladimir; Jurkin, Ema; Šimić Horvath, Marija" rgn:1898 "journal article" "Circles of curvature at points of parabola in isotropic plane" "Volenec, Vladimir; Horvath, Marija Šimić; Jurkin, Ema" rgn:1722 "journal article" "Parabolas in the isotropic plane" "Volenec, Vladimir; Jurkin, Ema; Šimić Horvath, Marija" rgn:1724 "journal article" "Covertex inscribed triangles of parabola in isotropic plane" "Volenec, Vladimir; Jurkin, Ema; Šimić Horvath, Marija"