@article{MAN_1874__7_156650,
     author = {Enneper},
     title = {Untersuchungen \"uber orthogonale {Fl\"achensysteme}},
     journal = {Mathematische Annalen},
     pages = {456--480},
     publisher = {mathdoc},
     volume = {7},
     year = {1874},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1874__7_156650/}
}