@book{MSM_1926__11__1_0,
     author = {Bouligand, Georges},
     title = {Fonctions harmoniques. {Principes} de {Picard} et de {Dirichlet}},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {11},
     year = {1926},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1926__11__1_0/}
}