@article {15216,
	title = {Approximating the minimum equivalent digraph},
	journal = {SIAM Journal on Computing (SICOMP)},
	volume = {24},
	year = {1995},
	month = {1995///},
	pages = {859 - 872},
	author = {Khuller, Samir and Raghavachari,B. and Young,N.}
}
