@article{MM2_1975__15_154305,
     author = {Georg Schumacher},
     title = {\"Uber ebene, faktorisierbare und einfache holomorphe {Abbildungen.}},
     journal = {Manuscripta mathematica},
     pages = {33--44},
     publisher = {mathdoc},
     volume = {15},
     year = {1975},
     zbl = {0314.32015},
     url = {http://geodesic.mathdoc.fr/item/MM2_1975__15_154305/}
}