Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1933__107_159584, author = {H. Hopf and W. Binow}, title = {Die topologischen {Gestalten} differentialgeometrisch verwandter {Fl\"achen}}, journal = {Mathematische Annalen}, pages = {113--123}, publisher = {mathdoc}, volume = {107}, year = {1933}, zbl = {0005.08301}, url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159584/} }
H. Hopf; W. Binow. Die topologischen Gestalten differentialgeometrisch verwandter Flächen. Mathematische Annalen, Tome 107 (1933), pp. 113-123. http://geodesic.mathdoc.fr/item/MAN_1933__107_159584/