4-dimensional Minkowski planes with large automorphism group.
A family of flat Minkowski planes admitting 3-dimensional simple groups of automorphisms.
Criteria for two-dimensional circle planes.
Dicovering spaces.
Locally Classical Topological Benz Planes are Classical.
Plane models of semi-biplanes.
Semiclassical 4-dimensional Laguerre Planes.
Split semi-biplanes in antiregular generalized quadrangles.
The Nonexistence of Certain Topological Polygons.
Topological pseudo-ovals, elation Laguerre planes, and elation generalized quadrangles.
Topologische Möbiusebenen in spiegelungsgeometrischer Darstellung
Topology and dimension of stable planes: On a conjecture of H. Freudenthal.
Über topologische Minkowski-Ebenen und topologische affine Ebenen
Virtual points and separating sets in spherical circle planes.