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@article{MZ_1977__157_172608, author = {Ulrich Hirsch}, title = {On {Branched} {Coverings} of the {3-Sphere.}}, journal = {Mathematische Zeitschrift}, pages = {225--236}, publisher = {mathdoc}, volume = {157}, year = {1977}, zbl = {0347.57002}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__157_172608/} }
Ulrich Hirsch. On Branched Coverings of the 3-Sphere.. Mathematische Zeitschrift, Tome 157 (1977), pp. 225-236. http://geodesic.mathdoc.fr/item/MZ_1977__157_172608/