@book{SB_1972-1973__15_,
     author = {Collectif},
     title = {S\'eminaire {Bourbaki} : vol. 1972/73, expos\'es 418-435},
     series = {S\'eminaire Bourbaki},
     publisher = {Springer-Verlag},
     number = {15},
     year = {1974},
     url = {http://www.numdam.org/item/SB_1972-1973__15_/}
}