Geodesic
An upper bound on the chromatic number of 2-planar graphs
Discussiones Mathematicae. Graph Theory, Tome 43 (2023) no. 3, pp. 703-720 Cet article a éte moissonné depuis la source Library of Science

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It is proved that any 2-planar graph (i.e., a graph which can be drawn on a plane such that any edge intersects at most two others) has a proper vertex coloring with 9 colors.
Keywords: 2-planar graphs, chromatic number 
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Karpov, Dmitri V. An upper bound on the chromatic number of 2-planar graphs. Discussiones Mathematicae. Graph Theory, Tome 43 (2023) no. 3, pp. 703-720. http://geodesic.mathdoc.fr/item/DMGT_2023_43_3_a7/

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