@article{IM_1971__15_142121,
     author = {Wulf-Dieter Geyer},
     title = {Zahm verzweigter {\"Uberlagerungen} mit orthosingul\"arem {Verzweigungsort.}},
     journal = {Inventiones mathematicae},
     pages = {67--71},
     year = {1971},
     volume = {15},
     zbl = {0226.14010},
     url = {http://geodesic.mathdoc.fr/item/IM_1971__15_142121/}
}