@incollection{SB_1968-1969__11__173_0,
     author = {Koszul, Jean-Louis},
     title = {Travaux de {J.} {Stallings} sur la d\'ecomposition des groupes en produits libres},
     booktitle = {S\'eminaire Bourbaki : vol. 1968/69, expos\'es 347-363},
     series = {S\'eminaire Bourbaki},
     note = {talk:356},
     pages = {173--185},
     publisher = {Springer-Verlag},
     number = {11},
     year = {1971},
     zbl = {0217.36001},
     language = {fr},
     url = {http://archive.numdam.org/item/SB_1968-1969__11__173_0/}
}