@article{hal-00130367,
author = {Perrin, Nicolas},
title = {Singular locus of rational ruled surfaces},
journal = {HAL},
volume = {2002},
number = {0},
year = {2002},
language = {fr},
url = {http://dml.mathdoc.fr/item/hal-00130367}
}
Perrin, Nicolas. Singular locus of rational ruled surfaces. HAL, Tome 2002 (2002) no. 0, . http://gdmltest.u-ga.fr/item/hal-00130367/