@article{1183501631, author = {Carpenter, A. F.}, title = {Involutory systems of curves on ruled surfaces}, journal = {Bull. Amer. Math. Soc.}, volume = {45}, number = {11}, year = {1939}, pages = { 107-113}, language = {en}, url = {http://dml.mathdoc.fr/item/1183501631} }
Carpenter, A. F. Involutory systems of curves on ruled surfaces. Bull. Amer. Math. Soc., Tome 45 (1939) no. 11, pp. 107-113. http://gdmltest.u-ga.fr/item/1183501631/