@inproceedings{STOC-1999-CharikarGTS,
	author        = "Moses Charikar and Sudipto Guha and Éva Tardos and David B. Shmoys",
	booktitle     = "{Proceedings of the 31st Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/301250.301257",
	isbn          = "1-58113-067-8",
	pages         = "1--10",
	publisher     = "{ACM}",
	title         = "{A Constant-Factor Approximation Algorithm for the k-Median Problem}",
	year          = 1999,
}