Grötzsch's theorem on $3$-colorings.
Grünbaum, Branko
Michigan Math. J., Tome 10 (1963) no. 1, p. 303-310 / Harvested from Project Euclid
Text on Project Euclid
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Publié le : 1963-08-14
Classification:  55.10 
@article{1028998916,
     author = {Gr\"unbaum, Branko},
     title = {Gr\"otzsch's theorem on $3$-colorings.},
     journal = {Michigan Math. J.},
     volume = {10},
     number = {1},
     year = {1963},
     pages = { 303-310},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028998916}
}

Grünbaum, Branko. Grötzsch's theorem on $3$-colorings.. Michigan Math. J., Tome 10 (1963) no. 1, pp.  303-310. http://gdmltest.u-ga.fr/item/1028998916/