@incollection{AST_1985__S131__5_0,
     author = {Weil, Andr\'e},
     title = {Lettre {d'Andr\'e} {Weil} \`a {Henri} {Cartan}},
     booktitle = {\'Elie Cartan et les math\'ematiques d'aujourd'hui - Lyon, 25-29 juin 1984},
     series = {Ast\'erisque},
     pages = {5--7},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {S131},
     year = {1985},
     mrnumber = {837192},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1985__S131__5_0/}
}