1. Some remarks on Tits geometries;Brouwer;Ind. Math.,1983
2. A.E. Brouwer, A.M. Cohen: Local recognition of Tits geometries of classical type, Preprint.
3. An approach of building geometries based on points, lines and convexity;Buekenhout;Europ. J. Combin.,1982
4. Cooperstein's Theory;Buekenhout;Simon Stevin,1983
5. On the foundations of polar geometry;Buekenhout;Geom. Ded.,1974