@incollection{SB_1977-1978__20__41_0,
     author = {Fournier, Jean-Claude},
     title = {Le th\'eor\`eme du coloriage des cartes (ex-conjecture de {Heawood} et conjecture des quatre couleurs)},
     booktitle = {S\'eminaire Bourbaki : vol. 1977/78, expos\'es 507-524},
     series = {S\'eminaire Bourbaki},
     note = {talk:509},
     pages = {41--64},
     publisher = {Springer-Verlag},
     number = {20},
     year = {1979},
     mrnumber = {554214},
     zbl = {0437.05020},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1977-1978__20__41_0/}
}