@article{02012535,
title = {The hull number of an oriented graph.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2003},
year = {2003},
pages = {2265-2275},
doi = {10.1155/S0161171203210577},
zbl = {1027.05034},
language = {en},
url = {http://dml.mathdoc.fr/item/02012535}
}
Chartrand, Gary; Fink, John Frederick; Zhang, Ping. The hull number of an oriented graph.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 2265-2275. doi : 10.1155/S0161171203210577. http://gdmltest.u-ga.fr/item/02012535/