@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/