Elips: Perbedaan antara revisi

* ''The Shape and History of The Ellipse in Washington, D.C.''<ref>{{Cite web|url=[https://faculty.evansville.edu/ck6/ellipse.pdf|title= The Shape and History of theThe Ellipse in Washington, D.C.|last=|first=|date=|website=faculty.evansville.edu|access-date=07-08-2020}}</ref>]'' oleh [[Clark Kimberling]]