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@article{CMH_1931__3_138562, author = {H. Hopf and W. Rinow}, title = {Ueber den {Begriff} der vollst\"andigen differentialgeometrischen {Fl\"ache.}}, journal = {Commentarii mathematici Helvetici}, pages = {209--225}, publisher = {mathdoc}, volume = {3}, year = {1931}, zbl = {0002.35004}, url = {http://geodesic.mathdoc.fr/item/CMH_1931__3_138562/} }
H. Hopf; W. Rinow. Ueber den Begriff der vollständigen differentialgeometrischen Fläche.. Commentarii mathematici Helvetici, Tome 3 (1931), pp. 209-225. http://geodesic.mathdoc.fr/item/CMH_1931__3_138562/