A four-vertex theorem for space curves.
Trefoil knots with tritangent planes.
Der Vierscheitelsatz in Relativ- und Minkowski-Geometrie.
Ungleichungen für die Quermassenintegrale polarer Körper.
Extensions of an inequality of Bonnesen to D-dimensional space and curvature conditions for convex bodies.
On an oscillation criterion of Hartman, Wintner and Potter
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