@article{urn:eudml:doc:42172, title = {When is a group homomorphism a covering homomorphism? }, journal = {Extracta Mathematicae}, volume = {22}, year = {2007}, pages = {325-330}, zbl = {1146.54017}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:42172} }
Santos, J. C. When is a group homomorphism a covering homomorphism? . Extracta Mathematicae, Tome 22 (2007) pp. 325-330. http://gdmltest.u-ga.fr/item/urn:eudml:doc:42172/