@inproceedings{STOC-2007-DunaganH,
	author        = "John Dunagan and Nicholas J. A. Harvey",
	booktitle     = "{Proceedings of the 39th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/1250790.1250821",
	isbn          = "978-1-59593-631-8",
	pages         = "207--216",
	publisher     = "{ACM}",
	title         = "{Iteratively constructing preconditioners via the conjugate gradient method}",
	year          = 2007,
}