Affine buildings and CAT(0)-spaces

A functorial approach to projective representations of Tits-buildings and the associated groups of Lie type.

Automorphism groups of rank 2 geometries associated to exceptional groups of Lie type

Buildings of exceptional type: their geometries and their representations.

Exceptional Groups and Exceptional Geometries in the Theory of Tits Buildings

Exceptional groups and Moufang sets of polar type.

FWO junior vis. Postdoc. Fellow Ricardo Abreu Blaya. Boudary value theory in hermitean Clifford analysis.

Linear Descent in Spherical Tits-Buildings with Applications to Rank 1 Groups, Density Theorems in Chevalley Groups, and Finite Geometry.

New developments in Lie incidence geometries

Projective Remoteness planes associated to singular quadrics and their collineation groups.

Characterization and classification theory of generalized quadrangles and related structures.

Hilbert's Tenth Problem and diophantine sets

Locally compact groups acting on discrete geometric structures

Moufang sets

Semi finite fields.

Subgraphs and codes in distance-regular graphs in incidence geometry

The Kneser-Tits problem for linear algebraic groups of type E_8 of relative rank 2