@inproceedings{STOC-1998-Freedman,
	author        = "Michael H. Freedman",
	booktitle     = "{Proceedings of the 30th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/276698.276871",
	isbn          = "0-89791-962-9",
	pages         = "572--576",
	publisher     = "{ACM}",
	title         = "{K-sat on Groups and Undecidability}",
	year          = 1998,
}