@article{MAN_1973__201_162370,
     author = {Hans Wilhelm Alt},
     title = {Verzweigungspunkte von {H-Fl\"achen.} {II} .},
     journal = {Mathematische Annalen},
     pages = {33--56},
     publisher = {mathdoc},
     volume = {201},
     year = {1973},
     zbl = {0257.58005},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162370/}
}