1. Closed orbits parallel to quadrilaterals inscribed in various conic sections. Issue 7 (9th August 2021) Authors: Stupel, Moshe; Weissman, Shula; Sigler, Avi Journal: International journal of mathematical education in science and technology Issue: Volume 52:Issue 7(2021) Page Start: 1097 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗