@article{CG_1997___26_5_0,
     author = {Andr\'e, Jacques},
     title = {Caract\`eres num\'eriques~: introduction},
     journal = {Cahiers GUTenberg},
     pages = {5--44},
     publisher = {Association GUTenberg},
     number = {26},
     year = {1997},
     language = {fr},
     url = {http://www.numdam.org/item/CG_1997___26_5_0/}
}