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Central ConicAn Ellipse or Hyperbola. See also Conic Section References
Coxeter, H. S. M. and Greitzer, S. L. Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 146-150, 1967.Ogilvy, C. S. Excursions in Geometry. New York: Dover, p. 77, 1990.
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