Geodesic
Estimating the Minimal Number of Colors in Acyclic -Strong Colorings of Maps on Surfaces
Matematičeskie zametki, Tome 72 (2002) no. 1, pp. 35-37 Cet article a éte moissonné depuis la source Math-Net.Ru

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A coloring of the vertices of a graph is called acyclic if the ends of each edge are colored in distinct colors, and there are no two-colored cycles. Suppose each face of rank $k$, $k\ge 4$, in a map on a surface $S^N$ is replaced by the clique having the same number of vertices. It is proved in [1] that the resulting pseudograph admits an acyclic coloring with the number of colors depending linearly on $N$ and $k$. In the present paper we prove a sharper estimate $55(-Nk)^{4/7}$ for the number of colors provided that $k\ge 1$ and $-N\ge 5^7k^{4/3}$. 
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     author = {O. V. Borodin and A. V. Kostochka and A. Raspaud and E. Sopena},
     title = {Estimating the {Minimal} {Number} of {Colors} in {Acyclic} {-Strong} {Colorings} of {Maps} on {Surfaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {35--37},
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O. V. Borodin; A. V. Kostochka; A. Raspaud; E. Sopena. Estimating the Minimal Number of Colors in Acyclic -Strong Colorings of Maps on Surfaces. Matematičeskie zametki, Tome 72 (2002) no. 1, pp. 35-37. http://geodesic.mathdoc.fr/item/MZM_2002_72_1_a2/

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