1. A combinatorial problem in geometry;Erdős;Compos. Math.,1935
2. T. Gerken, On empty convex hexagons in planar point sets (submitted for publication)
3. Konvexe Fünfecke in ebenen Punktmengen;Harborth;Elem. Math.,1978
4. Sets with no empty 7-gons;Horton;Canadian Math. Bull.,1983
5. A modular version of the Erdős–Szekeres theorem;Károlyi;Studia Sci. Math. Hungar.,2001