1. The Theory of Finite Linear Spaces;Batten,1993
2. Foundations of incidence geometry;Buekenhout,1995
3. On a combinatorial problem;de Bruijn;Indag. Math.,1948
4. Finite Geometries;Dembowski,1968
5. Locally projective-planar lattices which satisfy the bundle theorem;Kahn;Math. Z.,1980