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@article{MAN_1875__9_156714, author = {Sturm}, title = {Zur {Theorie} der algebraischen {Fl\"achen}}, journal = {Mathematische Annalen}, pages = {573--1}, publisher = {mathdoc}, volume = {9}, year = {1875}, zbl = {08.0393.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1875__9_156714/} }
Sturm. Zur Theorie der algebraischen Flächen. Mathematische Annalen, Tome 9 (1875), pp. 573-1. http://geodesic.mathdoc.fr/item/MAN_1875__9_156714/