@inproceedings{STOC-2011-FeldmanL,
	author        = "Dan Feldman and Michael Langberg",
	booktitle     = "{Proceedings of the 43rd Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/1993636.1993712",
	isbn          = "978-1-4503-0691-1",
	pages         = "569--578",
	publisher     = "{ACM}",
	title         = "{A unified framework for approximating and clustering data}",
	year          = 2011,
}