@article{MAN_1872__5_156570,
     author = {Enneper},
     title = {Bemerkungen \"uber die {Enveloppe} einer {Fl\"ache}},
     journal = {Mathematische Annalen},
     pages = {304--309},
     publisher = {mathdoc},
     volume = {5},
     year = {1872},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1872__5_156570/}
}