Zum Büschelsatz in der Geometrie der Algebren.
Der Satz von Liouville über räumliche orthogonaltreue (winkeltreue) Abbildungen für beliebige Signatur.
On a functional equation arising from hyperbolic geometry.
Laguerre-Geometrie über einem lokalen Ring.
(8..., 6...) - Konfigurationen in Laguerre-, Möbius- und weiteren Geometrien.
A Beckmann Quarles Type Theorem for Plane Lorentz Transformations.
On a Functional Equation in Connection with Derivations.
The functional equation of distance preservance in spaces over rings. (Short Communication).
On the Functional Equation of Distance Preserving Mappings over Rings (Über die Funktionalgleichung der Längentreue im Ringbereich) (Short Communication)
The functional equation of distance preservance in spaces over rings.
The cardinality of the set of discontinuous solutions of a class of functional equations.
Correction to "On a functional equation arising from hyperbolic geometry", Volume 21 (1980), 113-116.
A class of nowhere continuous solutions of Baxter's equation.
On mappings preserving a single Lorentz-Minkowski-distance in Hjelmslev's classical plane.
Isometrien in normierten Räumen.
On the functional equation ... (Short Communication).
A conditional dilation equation.
On a general principle in geometry that leads to functional equations.
A conditional dilation equation. (Summary).
Die Heavisidefunktion als spezielle Lösung ihrer Funktionalgleichung.
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