@article{IM_1978__45_142545,
     author = {Allan L. Edmonds and Israel Berstein},
     title = {The {Degree} and {Branch} {Set} of a {Branched} {Covering.}},
     journal = {Inventiones mathematicae},
     pages = {213--220},
     publisher = {mathdoc},
     volume = {45},
     year = {1978},
     zbl = {0359.55003},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__45_142545/}
}