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Ellipsoid - Wikipedia
Ellipsoid - Math.net
Ellipsoid | Surfaces, Axes, Foci | Britannica
Ellipsoid -- from Wolfram MathWorld
Earth ellipsoid - Wikipedia
The ellipsoid - Math Insight
Ellipsoid: Definitions and Examples - Club Z! Tutoring
Ellipsoid - Encyclopedia of Mathematics
4.3: The Ellipsoid - Physics LibreTexts
1.7: Quadric Surfaces - Mathematics LibreTexts