A combinatorial problem in geometry
Erdös, P. ; Szekeres, G.
Compositio Mathematica, Tome 2 (1935), p. 463-470 / Harvested from Numdam
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@article{CM_1935__2__463_0,
     author = {Erd\"os, P\'al and Szekeres, G.},
     title = {A combinatorial problem in geometry},
     journal = {Compositio Mathematica},
     volume = {2},
     year = {1935},
     pages = {463-470},
     zbl = {0012.27010},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CM_1935__2__463_0}
}

Erdös, P.; Szekeres, G. A combinatorial problem in geometry. Compositio Mathematica, Tome 2 (1935) pp. 463-470. http://gdmltest.u-ga.fr/item/CM_1935__2__463_0/