| Publication | Date of Publication | Type |
|---|
| Cayley-Klein geometries and projective-metric geometry | 2022-06-20 | Paper |
| Axiom systems implying infinity in the foundations of geometry | 2021-04-29 | Paper |
| Absolute isotropic geometry | 2021-03-03 | Paper |
| Cyclic order: a geometric analysis | 2020-10-15 | Paper |
| The Thomsen-Bachmann correspondence in metric geometry. I | 2019-03-15 | Paper |
| The Thomsen-Bachmann correspondence in metric geometry. II | 2019-03-15 | Paper |
| A theory of duality in Euclidean geometry | 2018-06-25 | Paper |
| Metric Geometries in an Axiomatic Perspective | 2018-03-13 | Paper |
| The principle of duality in Euclidean and in absolute geometry | 2017-04-20 | Paper |
| An axiomatic foundation of Cayley-Klein geometries | 2017-02-02 | Paper |
| An axiomatic analysis of the Droz-Farny line theorem | 2016-12-21 | Paper |
| The Steiner-Lehmus theorem and ``triangles with congruent medians are isosceles hold in weak geometries | 2016-05-25 | Paper |
| Ordered metric geometry | 2015-12-04 | Paper |
| A note on transversals in hyperbolic planes | 2015-02-26 | Paper |
| Ordered groups and ordered geometries | 2015-02-09 | Paper |
| The calculus of reflections and the order relation in hyperbolic geometry | 2012-12-27 | Paper |
| Non-euclidean geometries: the Cayley-Klein approach | 2011-02-03 | Paper |
| On M. T. Calapso's characterization of the metric of an absolute plane | 2009-06-08 | Paper |
| Lattice theory and metric geometry | 2009-01-29 | Paper |
| Classical non-Euclidean geometries -- their historical development and significance and their representation. I | 2006-03-17 | Paper |
| Orthogonal Cayley-Klein groups | 2006-03-07 | Paper |
| Projective spaces with Cayley-Klein metrics | 2005-05-06 | Paper |
| Classical non-Euclidean geometries -- their historical development and significance and their representation. II | 2005-02-24 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4384971 | 1998-11-01 | Paper |
| Coeuklidische Hjelmslevgruppen. (On co-Euclidean Hjelmslev groups) | 1989-01-01 | Paper |
| Zum Begriff Der Projektiv-Metrischen Ebene | 1988-01-01 | Paper |
| Finite Cayley-Klein geometries. | 1987-01-01 | Paper |
| The Desargues configuration and inversive geometry | 1986-01-01 | Paper |
| Cominkowskische und absolute Geometrie. (Cominkowskian and absolute geometry) | 1986-01-01 | Paper |
| Eine Synthetische Charakterisierung der Cayley‐Kleinschen Geometrien | 1985-01-01 | Paper |
| Ein operativer Beweis des Spernerschen Lemmas | 1984-01-01 | Paper |
| Eine Algebraisierung euklidischer Ebenen | 1984-01-01 | Paper |
| Ein spiegelungsgeometrischer Aufbau der cominkowskischen Geometrie | 1984-01-01 | Paper |
| Hjelmslevgruppen, in denen sich die Punkte gegen Geraden austauschen lassen | 1983-01-01 | Paper |
| Algebraisierung singulärer Hjelmslevgruppen | 1982-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3858858 | 1979-01-01 | Paper |
