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[2] The Math Forum, “Ellipsoid and Plane Intersection Equation,” 2000. http://mathforum.org/library/drmath/view/51781.html
[3] The Math Forum, “Intersection of Hyperplane and an Ellipsoid,” 2007. http://mathforum.org/library/drmath/view/72315.html
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[7] The Math Forum, “Equation of an Ellipse in 3-Space,” 2003. http://mathforum.org/library/drmath/view/63373.html