@inproceedings{STOC-1993-LundY,
	author        = "Carsten Lund and Mihalis Yannakakis",
	booktitle     = "{Proceedings of the 25th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/167088.167172",
	isbn          = "0-89791-591-7",
	pages         = "286--293",
	publisher     = "{ACM}",
	title         = "{On the hardness of approximating minimization problems}",
	year          = 1993,
}