@incollection{AST_1975__24-25__109_0,
     author = {Serre, Jean-Pierre},
     title = {Valeurs propres des op\'erateurs de {Hecke} modulo $\ell$},
     booktitle = {Journ\'ees arithm\'etiques de Bordeaux},
     series = {Ast\'erisque},
     pages = {109--117},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {24-25},
     year = {1975},
     mrnumber = {382173},
     zbl = {0305.10021},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1975__24-25__109_0/}
}