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@article{MAN_1880__16_156905, author = {Bianchi}, title = {Ueber die {Fl\"achen} mit constanter negativer {Kr\"ummung}}, journal = {Mathematische Annalen}, pages = {577--582}, publisher = {mathdoc}, volume = {16}, year = {1880}, zbl = {12.0576.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156905/} }
Bianchi. Ueber die Flächen mit constanter negativer Krümmung. Mathematische Annalen, Tome 16 (1880), pp. 577-582. http://geodesic.mathdoc.fr/item/MAN_1880__16_156905/