@article{MZ_1972__127_171780,
     author = {Hans Wilhelm Alt},
     title = {Verzweigungspunkte von {H-Fl\"achen.} {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {333--362},
     publisher = {mathdoc},
     volume = {127},
     year = {1972},
     zbl = {0253.58007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__127_171780/}
}