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@article{MS2_1958__6_165680, author = {Anton Jensen}, title = {On the {Homotopy} {Structure} of {Coverings.}}, journal = {Mathematica Scandinavica}, pages = {137--159}, publisher = {mathdoc}, volume = {6}, year = {1958}, zbl = {0089.17903}, url = {http://geodesic.mathdoc.fr/item/MS2_1958__6_165680/} }
Anton Jensen. On the Homotopy Structure of Coverings.. Mathematica Scandinavica, Tome 6 (1958), pp. 137-159. http://geodesic.mathdoc.fr/item/MS2_1958__6_165680/