A combinatorial problem in geometry
Compositio Mathematica, Tome 2 (1935), pp. 463-470. 
@article{CM_1935__2__463_0,
     author = {Erd\"os, P. and Szekeres, G.},
     title = {A combinatorial problem in geometry},
     journal = {Compositio Mathematica},
     pages = {463--470},
     publisher = {Johnson Reprint Corporation},
     volume = {2},
     year = {1935},
     zbl = {0012.27010},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1935__2__463_0/}
}
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Erdös, P.; Szekeres, G. A combinatorial problem in geometry. Compositio Mathematica, Tome 2 (1935), pp. 463-470. http://archive.numdam.org/item/CM_1935__2__463_0/