Every planar map is four colorable. Part I: Discharging
Appel, K. ; Haken, W.
Illinois J. Math., Tome 21 (1977) no. 4, p. 429-490 / Harvested from Project Euclid
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Publié le : 1977-09-15
Classification:  05C15 
@article{1256049011,
     author = {Appel, K. and Haken, W.},
     title = {Every planar map is four colorable. Part I: Discharging},
     journal = {Illinois J. Math.},
     volume = {21},
     number = {4},
     year = {1977},
     pages = { 429-490},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1256049011}
}

Appel, K.; Haken, W. Every planar map is four colorable. Part I: Discharging. Illinois J. Math., Tome 21 (1977) no. 4, pp.  429-490. http://gdmltest.u-ga.fr/item/1256049011/