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@article{MAN_1935__111_159794, author = {B. Ramamurti}, title = {On rational normal ruled surfaces}, journal = {Mathematische Annalen}, pages = {582--586}, publisher = {mathdoc}, volume = {111}, year = {1935}, zbl = {61.0717.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1935__111_159794/} }
B. Ramamurti. On rational normal ruled surfaces. Mathematische Annalen, Tome 111 (1935), pp. 582-586. http://geodesic.mathdoc.fr/item/MAN_1935__111_159794/