@article{05152749,
title = {On minimum size blocking sets of external lines to a quadric in },
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {48},
year = {2007},
pages = {209-215},
zbl = {1121.51006},
language = {en},
url = {http://dml.mathdoc.fr/item/05152749}
}
Biondi, P.; Lo Re, P.M.L.; Storme, L. On minimum size blocking sets of external lines to a quadric in . Beiträge zur Algebra und Geometrie, Tome 48 (2007) pp. 209-215. http://gdmltest.u-ga.fr/item/05152749/