Über algebraische Flächen vierter Ordnung im pro- jektiven R4
Nichteuklidische Fußpunktkurven.
On Strictly Convex Curves and Linear Monotonicity.
Solution of problem 15 (Vol. 3 (1955), p. 306)
On Helices in the Euclidean n-Space.
On Linearly Monotone Curves in the Projective n-Space.
On the Double Tangents of Plane Closed Curves.
On Polygons of Order n in Projective n-Space, with an Application to Strictly Convex Curves.
On cyclic curves in the Euclidean n-space.
On a conjecture of G. Bol.
A relation between the numbers of singular points and singular lines of a plane closed curve.
The Osculating Conics of Steiner`s Hypocycloid.
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