Le théorème du coloriage des cartes (ex-conjecture de Heawood et conjecture des quatre couleurs)
Séminaire Bourbaki : vol. 1977/78, exposés 507-524, Séminaire Bourbaki, no. 20 (1979), Exposé no. 509, 24 p. 
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     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},
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Fournier, Jean-Claude. Le théorème du coloriage des cartes (ex-conjecture de Heawood et conjecture des quatre couleurs), dans Séminaire Bourbaki : vol. 1977/78, exposés 507-524, Séminaire Bourbaki, no. 20 (1979), Exposé no. 509, 24 p. http://www.numdam.org/item/SB_1977-1978__20__41_0/

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