Geodesic
On maps of the two-dimensional sphere
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 58 (2003) no. 6, pp. 1218-1219 
E. V. Shchepin. On maps of the two-dimensional sphere. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 58 (2003) no. 6, pp. 1218-1219. http://geodesic.mathdoc.fr/item/RM_2003_58_6_a16/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[5] K. Kuratovskii, Topologiya, t. 2, Mir, M., 1969 | MR