Halbeinfache Automorphismengruppen von vierdimensionalen stabilen Ebenen sind quasi-einfach.
Topological pseudo-ovals, elation Laguerre planes, and elation generalized quadrangles.
Compact Projective Planes with Homogeneous Ovals.
Equivariant Embeddings of Low Dimensional Symmetric Planes.
Stable Planes with Isotropic Points.
Classification of 4-Dimensional Symmetric Planes.
Schleiermachers Starrheitsbedingung für Projektivitäten in der Topologischen Geometric.
Topology and dimension of stable planes: On a conjecture of H. Freudenthal.
Actions of SO(3) on 4-dimensional stable planes. (Short Communication).
Actions of SO(3) on 4-dimensional stable planes.
Homogeneous compact projective planes.
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