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@article{MAN_1880__16_156904, author = {Voss}, title = {Zur {Theorie} des {Riemann'schen} {Kr\"ummmigsmasses}}, journal = {Mathematische Annalen}, pages = {571--576}, publisher = {mathdoc}, volume = {16}, year = {1880}, zbl = {12.0570.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156904/} }
Voss. Zur Theorie des Riemann'schen Krümmmigsmasses. Mathematische Annalen, Tome 16 (1880), pp. 571-576. http://geodesic.mathdoc.fr/item/MAN_1880__16_156904/