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@article{MAN_1910__68_158445, author = {G. Sannia}, title = {Geometria differenziale delle congruenze rettilinee}, journal = {Mathematische Annalen}, pages = {409--416}, publisher = {mathdoc}, volume = {68}, year = {1910}, zbl = {41.0733.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1910__68_158445/} }
G. Sannia. Geometria differenziale delle congruenze rettilinee. Mathematische Annalen, Tome 68 (1910), pp. 409-416. http://geodesic.mathdoc.fr/item/MAN_1910__68_158445/