@article{PIM_1995_N_S_57_71_a5,
     author = {Paul Erd\"os},
     title = {On {Some} {Problems} in {Combinatorial} set {Theory}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {61 },
     year = {1995},
     volume = {_N_S_57},
     number = {71},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1995_N_S_57_71_a5/}
}