@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/