Geodesic
4-critical 4-valent planar graphs constructed with crowns.
Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 15-22.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Mots-clés : chromatic number, crowns 
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     author = {G. Koester},
     title = {4-critical 4-valent planar graphs constructed with crowns.},
     journal = {Mathematica Scandinavica},
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     publisher = {mathdoc},
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     number = {2},
     year = {1990},
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G. Koester. 4-critical 4-valent planar graphs constructed with crowns.. Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 15-22. http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167117/