@article{MAN_1985__270_182970,
     author = {U. Pinkall},
     title = {Dupin {Hypersurfaces.}},
     journal = {Mathematische Annalen},
     pages = {427--440},
     year = {1985},
     volume = {270},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__270_182970/}
}