@article{GDZPPN002095920,
title = {Projective Stability of Ruled Surfaces.},
journal = {Inventiones mathematicae},
volume = {56},
year = {1980},
pages = {269-304},
zbl = {0423.14005},
url = {http://dml.mathdoc.fr/item/GDZPPN002095920}
}
Morrison, Ian. Projective Stability of Ruled Surfaces.. Inventiones mathematicae, Tome 56 (1980) pp. 269-304. http://gdmltest.u-ga.fr/item/GDZPPN002095920/