1. Erdös, P., Szekeres, G.: A combinatorial problem in geometry. Comp. Math.2, 463?470 (1935).
2. Erdös, P., Szekers, G.: On some extremum problems in elementary geometry. Ann. Univ. Sci. Budapest3, 53?62 (1960).
3. Gale, D.: Neighbourly and cyclic polytopes. Proc. Symp. Pure Math. (Convexity)7, 225?232 (1963).
4. Grünbaum, B.: Convex Polytopes. London-New York-Sydney: Wiley. 1967.
5. Harborth, H.: Konvexe Fünfecke in ebenen Punktmengen. Elem. Math.33, 116?118 (1978).