no. 1
Combinatorial stacks and the four-color theorem
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 47 (2006) no. 1, pp. 29-49. 
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     title = {Combinatorial stacks and the four-color theorem},
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     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {47},
     number = {1},
     year = {2006},
     mrnumber = {2220060},
     zbl = {1107.18005},
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     url = {http://www.numdam.org/item/CTGDC_2006__47_1_29_0/}
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Attal, Romain. Combinatorial stacks and the four-color theorem. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 47 (2006) no. 1, pp. 29-49. http://www.numdam.org/item/CTGDC_2006__47_1_29_0/

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