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"Altitudes of a Tetrahedron and Traceless Quadratic Forms."
Hans Havlicek, Gunter Weiß (2003)
- Hans Havlicek, Gunter Weiß:
Altitudes of a Tetrahedron and Traceless Quadratic Forms. Am. Math. Mon. 110(8): 679-693 (2003)
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