Geodesic
When is a group homomorphism a covering homomorphism?
Extracta mathematicae, Tome 22 (2007) no. 3

Voir la notice de l'article provenant de la source Proyecto DML-E: Biblioteca Digital de Matemáticas 

@article{EXMATH_2007_2007_1_a22,
     author = {Santos, J. C. },
     title = {When is a group homomorphism a covering homomorphism?},
     journal = {Extracta mathematicae},
     pages = {325-330},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2007_2007_1_a22/}
}
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Santos, J. C. . When is a group homomorphism a covering homomorphism?. Extracta mathematicae, Tome 22 (2007) no. 3. http://geodesic.mathdoc.fr/item/EXMATH_2007_2007_1_a22/