@inproceedings{STOC-1993-WilliamsonGMV,
	author        = "David P. Williamson and Michel X. Goemans and Milena Mihail and Vijay V. Vazirani",
	booktitle     = "{Proceedings of the 25th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/167088.167268",
	isbn          = "0-89791-591-7",
	pages         = "708--717",
	publisher     = "{ACM}",
	title         = "{A primal-dual approximation algorithm for generalized Steiner network problems}",
	year          = 1993,
}