Geodesic
Strong chromatic index of planar graphs with large girth
Discussiones Mathematicae. Graph Theory, Tome 34 (2014) no. 4, pp. 723-733

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Let Δ ≥ 4 be an integer. In this note, we prove that every planar graph with maximum degree Δ and girth at least 10Δ+46 is strong (2Δ−1)-edgecolorable, that is best possible (in terms of number of colors) as soon as G contains two adjacent vertices of degree Δ. This improves [6] when Δ ≥ 6.
Keywords: planar graphs, edge coloring, 2-distance coloring, strong edgecoloring 
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     title = {Strong chromatic index of planar graphs with large girth},
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Jennhwa Chang, Gerard; Montassier, Mickael; Pêche, Arnaud; Raspaud, André. Strong chromatic index of planar graphs with large girth. Discussiones Mathematicae. Graph Theory, Tome 34 (2014) no. 4, pp. 723-733. http://geodesic.mathdoc.fr/item/DMGT_2014_34_4_a5/