@book{MSM_1931__46__1_0,
     author = {Haag, J.},
     title = {Le probl\`eme de {Schwarzschild}},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {46},
     year = {1931},
     zbl = {0001.24401},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1931__46__1_0/}
}