@book{MSM_1950__112__1_0,
     author = {Sierpi\'nski, W.},
     title = {Les ensembles projectifs et analytiques},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {112},
     year = {1950},
     mrnumber = {52484},
     zbl = {0039.04701},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1950__112__1_0/}
}