Every planar map is four colorable
Appel, K. ; Haken, W.
Bull. Amer. Math. Soc., Tome 82 (1976) no. 3, p. 711-712 / Harvested from Project Euclid
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Publié le : 1976-09-15
Classification:  05C15 
@article{1183538218,
     author = {Appel, K. and Haken, W.},
     title = {Every planar map is four colorable},
     journal = {Bull. Amer. Math. Soc.},
     volume = {82},
     number = {3},
     year = {1976},
     pages = { 711-712},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183538218}
}

Appel, K.; Haken, W. Every planar map is four colorable. Bull. Amer. Math. Soc., Tome 82 (1976) no. 3, pp.  711-712. http://gdmltest.u-ga.fr/item/1183538218/