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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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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