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The universal covers of certain semibiplanes
The universal covers of c.c*-geometries constructed from the length two orbits of certain involutory automorphism ofPG(2, q)are determined. It particular, we answer a question from .
The universal covers of the sporadic semibiplanes
We determine the universal covers of the few flag-transitive sporadic semibiplanes. They were already known by computer-aided coset enumeration. The method we are using seems to be new and of interest on its own.