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* {{cite journal | last=West | first=William Kyer | title=Problems in the Cultural History of the Ellipse | journal=Technology and Culture | publisher=JSTOR | volume=19 | issue=4 | year=1978 | issn=0040-165X | doi=10.2307/3103766 | page=709 | ref=harv}}
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* {{cite web | author=The Christian Science Monitor | title=The meaning of the 'Oval' Office | date=2009-01-02 | url=https://secure.csmonitor.com/Commentary/Opinion/2009/0102/p09s02-coop.html | ref=harv | access-date=2019-01-11}}
* {{cite web | title=Ellipse - mathematics | website=Encyclopedia Britannica | url=https://www.britannica.com/science/ellipse | ref={{sfnref |Encyclopedia Britannica}} | access-date=2018-12-02}}
* {{cite web | title=Geometry - mathematics | website=Encyclopedia Britannica | url=https://www.britannica.com/science/geometry | ref={{sfnref | Encyclopedia Britannica - Geometry}} | access-date=2018-09-16| archive-url = http://www.webcitation.org/74iCmZWN4 | archive-date = 16 December 2018 }}