@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://www.numdam.org/item/CM_1935__2__463_0/}
}