@article{GDZPPN002246392, title = {Zur Theorie der Curven doppelter Kr\"ummung .}, journal = {Mathematische Annalen}, volume = {20}, year = {1882}, pages = {72-83}, zbl = {13.0589.01}, url = {http://dml.mathdoc.fr/item/GDZPPN002246392} }
Enneper. Zur Theorie der Curven doppelter Krümmung .. Mathematische Annalen, Tome 20 (1882) pp. 72-83. http://gdmltest.u-ga.fr/item/GDZPPN002246392/