Geodesic
On trees covering chains or stars
Fundamentalʹnaâ i prikladnaâ matematika, Tome 13 (2007) no. 6, pp. 207-215.

Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper, in the context of the “dessins d'enfants” theory, we give a combinatorial criterion for a plane tree to cover a tree from the classes of “chains” or “stars.” We also discuss some applications of this result that are related to the arithmetical theory of torsion on curves. 
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F. B. Pakovich. On trees covering chains or stars. Fundamentalʹnaâ i prikladnaâ matematika, Tome 13 (2007) no. 6, pp. 207-215. http://geodesic.mathdoc.fr/item/FPM_2007_13_6_a11/

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