@book{CJPS_1982__4_,
     author = {Serre, Jean-Pierre},
     title = {Nombre de classes, formules de masse, nombres de {Tamagawa}},
     series = {Cours de Jean-Pierre Serre},
     number = {4},
     year = {1981-1982},
     language = {fr},
     url = {http://archive.numdam.org/item/CJPS_1982__4_/}
}