1. L. Batten, Geodesic subgraphs (to appear).
2. What is a subspace?;Buekenhout,1977
3. Diagrams for geometries and groups;Buekenhout;J. Combin Theory Ser. A,1979
4. The basic diagram of a geometry;Buekenhout,1981
5. F. Buekenhout, Cooperstein's theory, Simon Stevin (to appear).