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2. A characterization of some Lie incidence structures;Cooperstein;Geometriae Dedicata,1977
3. La Geometrie des Groupes Classiques;Dieudonne,1963
4. Invariant relations, coherent configurations and generalized polygons;Higman,1974
5. Pasch's axiom and projective spaces;Sprague;Discrete Maths,1981