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@article{MAN_1904__58_158123, author = {E.J. Wilczynski}, title = {A fundamental theorem in the theory of ruled surfaces}, journal = {Mathematische Annalen}, pages = {249--256}, publisher = {mathdoc}, volume = {58}, year = {1904}, url = {http://geodesic.mathdoc.fr/item/MAN_1904__58_158123/} }
E.J. Wilczynski. A fundamental theorem in the theory of ruled surfaces. Mathematische Annalen, Tome 58 (1904), pp. 249-256. http://geodesic.mathdoc.fr/item/MAN_1904__58_158123/