@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/