@book{MSM_1951__5__1_0,
     author = {L\'evy, Paul},
     title = {Analyse fonctionnelle, fonctions de lignes et \'equations aux d\'eriv\'ees fonctionnelles},
     series = {M\'emorial des sciences math\'ematiques},
     year = {1951},
     publisher = {Gauthier-Villars},
     number = {5},
     language = {fr},
     url = {https://www.numdam.org/item/MSM_1951__5__1_0/}
}