@article{10_4064_fm_51_2_117_129,
     author = {P. Erd\"os and A. Hajnal},
     title = {On a classification of denumerable order types and an application to the partition calculus},
     journal = {Fundamenta Mathematicae},
     pages = {117--129},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {1962},
     doi = {10.4064/fm-51-2-117-129},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-51-2-117-129/}
}