A Characterization of Motions as Bijections Preserving Inradius or Circumradius One.
A characterization of spheres among compact 3-bodies satisfying Crofton's theorem
A conjecture of Stein on plane dissections.
A generalization of a two triangle inequality.
A geometric inequality involving a mobile point in the place of the triangle.
A Geometric Theory of Surface Area.
A Geometric Theory of Surface Area.
A Geometric Theory of Surface Area. III.
A simpler construction of volume polynomials for a polyhedron.
A synthetic approach to the taxicab circles.
An isoperimetric inequality for the area of plane regions defined by binary forms
Archimedes was right.II.
Around the proof of the Legendre-Cauchy lemma on convex polygons.
Asymptotic volume formulae and hyperbolic ball packing.
Bemerkungen zu Determinanten-Theorie. Auszug aus Briefen an Herrn Baltzer.
Calcul du rayon de la sphère inscrite dans le tétraèdre
Chord-decreasing homeomorphisms in Euclidean spaces
Comparing the relative volume with the relative inradius and the relative width.
Das gemischte Volumen als Distribution.
Der Kreis mit minimaler Flächendifferenz zum Dreieck.