%0 Journal Article %A Erdös, P. %A Szekeres, G. %T A combinatorial problem in geometry %J Compositio Mathematica %D 1935 %P 463-470 %V 2 %I Johnson Reprint Corporation %U http://www.numdam.org/item/CM_1935__2__463_0/ %G en %F CM_1935__2__463_0