@book{MSM_1934__61__1_0,
     author = {Dulac, H.},
     title = {Points singuliers des \'equations diff\'erentielles},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {61},
     year = {1934},
     zbl = {0008.06501},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1934__61__1_0/}
}