@article {gzara2005exact,
	title = {Exact solution of the centralized network design problem on directed graphs},
	journal = {Networks: An International Journal},
	volume = {45},
	number = {4},
	year = {2005},
	pages = {181{\textendash}192},
	publisher = {Wiley Subscription Services, Inc., A Wiley Company Hoboken},
	author = {Gzara, Fatma and Goffin, Jean-Louis}
}
