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Sources

*Eric W. Weisstein. "Ellipse." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Ellipse.html

*Eric W. Weisstein. "Discriminant." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Discriminant.html

*Britton, Jill "Occurrence of the Conics" http://www.uhigh.ilstu.edu/math/thompson/Occurrence%20of%20the%20Conics.htm

*Sullivan, Michael, and Michael Sullivan, III. "Analytic Geometry." Precalculus. New Jersey: Prentice Hall, 2003. Chapter 9.