@article{GDZPPN00231827X, title = {Deformation of Maps to Branched Coverings in Dimension Three.}, journal = {Mathematische Annalen}, volume = {243}, year = {1979}, pages = {273-279}, zbl = {0406.57003}, url = {http://dml.mathdoc.fr/item/GDZPPN00231827X} }
Edmonds, Allan L. Deformation of Maps to Branched Coverings in Dimension Three.. Mathematische Annalen, Tome 243 (1979) pp. 273-279. http://gdmltest.u-ga.fr/item/GDZPPN00231827X/