@article{1183485656, author = {Graustein, W. C.}, title = {Note on a certain type of ruled surface}, journal = {Bull. Amer. Math. Soc.}, volume = {29}, number = {10}, year = {1923}, pages = { 341-344}, language = {en}, url = {http://dml.mathdoc.fr/item/1183485656} }
Graustein, W. C. Note on a certain type of ruled surface. Bull. Amer. Math. Soc., Tome 29 (1923) no. 10, pp. 341-344. http://gdmltest.u-ga.fr/item/1183485656/