@inproceedings{STOC-1998-CharikarCGG,
	author        = "Moses Charikar and Chandra Chekuri and Ashish Goel and Sudipto Guha",
	booktitle     = "{Proceedings of the 30th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/276698.276719",
	isbn          = "0-89791-962-9",
	pages         = "114--123",
	publisher     = "{ACM}",
	title         = "{Rounding via Trees: Deterministic Approximation Algorithms for Group Steiner Trees and k-Median}",
	year          = 1998,
}