1. Uniformität des Verbandes der Partitionen;Aigner;Math. Ann.,1974
2. Combinatorial Theory;Aigner,1979
3. Whitney numbers;Aigner,1987
4. A Pascal theorem applied to Minkowski geometry;Artzy;J. Geom.,1973
5. A symmetry theorem for Laguerre planes;Artzy;J. Geom.,1974