Geodesic
Sufficient conditions for the minimum $2$-distance colorability of plane graphs of girth $6$
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 3 (2006), pp. 441-450 Cet article a éte moissonné depuis la source Math-Net.Ru

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A trivial lower bound for the $2$-distance chromatic number $\chi_2(G)$ of any graph $G$ with maximum degree $\Delta$ is $\Delta+1$. It is known that if $G$ is planar and its girth is at least $7$, then for large enough $\Delta$ this bound is sharp, while for girth $6$ it is not true. We prove that if $G$ is planar, its girth is $6$, every edge is incident with a $2$-vertex, and $\Delta\ge31$, then $\chi_2(G)=\Delta+1$. 
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     title = {Sufficient conditions for the minimum $2$-distance colorability of plane graphs of girth~$6$},
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O. V. Borodin; A. O. Ivanova; T. K. Neustroeva. Sufficient conditions for the minimum $2$-distance colorability of plane graphs of girth $6$. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 3 (2006), pp. 441-450. http://geodesic.mathdoc.fr/item/SEMR_2006_3_a28/

[1] Jensen T. R., Toft B., Graph coloring problems, John Wiley Sons, New York, 1995 | MR | Zbl

[2] Borodin O. V., Glebov A. N., Ivanova A. O., Neustroeva T. K., Tashkinov V. A., “Dostatochnye usloviya 2-distantsionnoi $(\Delta+1)$-raskrashivaemosti ploskikh grafov”, Sibirskie elektronnye matematicheskie izvestiya, 1 (2004), 129–141 http://semr.math.nsc.ru/ | MR | Zbl

[3] Borodin O. V., Ivanova A. O., Neustroeva T. K., “Dostatochnye usloviya 2-distantsionnoi $(\Delta+1)$-raskrashivaemosti ploskikh grafov s obkhvatom 6”, Diskretnyi analiz i issledovanie operatsii, Seriya 1, 12:3 (iyul–sentyabr 2005), 32–47 | MR