@book{MSM_1932__57__1_0,
     author = {Delsarte, Jean},
     title = {Les groupes de transformations lin\'eaires dans l'espace de {Hilbert}},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {57},
     year = {1932},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1932__57__1_0/}
}