@article{10_4153_CMB_1961_002_5,
     author = {Atkinson, F. V.},
     title = {On a {Problem} of {Erd\"os} and {Szekeres}},
     journal = {Canadian mathematical bulletin},
     pages = {7--12},
     year = {1961},
     volume = {4},
     number = {1},
     doi = {10.4153/CMB-1961-002-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-002-5/}
}