@inproceedings{STOC-1999-BorodinOR99a,
	author        = "Allan Borodin and Rafail Ostrovsky and Yuval Rabani",
	booktitle     = "{Proceedings of the 31st Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/301250.301367",
	isbn          = "1-58113-067-8",
	pages         = "435--444",
	publisher     = "{ACM}",
	title         = "{Subquadratic Approximation Algorithms for Clustering Problems in High Dimensional Spaces}",
	year          = 1999,
}