Geodesic
A certain interpretation of the 4-coloring of a planar graph
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {\'E. G. Belaga},
     title = {A certain interpretation of the 4-coloring of a~planar graph},
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     url = {http://geodesic.mathdoc.fr/item/RM_1972_27_3_a7/}
}
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É. G. Belaga. A certain interpretation of the 4-coloring of a planar graph. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3. http://geodesic.mathdoc.fr/item/RM_1972_27_3_a7/

[1] P. J. Heawood, “Map-colour theorem”, Quart. J. Math., 24 (1890), 332–338