@inproceedings{STOC-1994-JiangSV,
	author        = "Tao Jiang and Joel I. Seiferas and Paul M. B. Vitányi",
	booktitle     = "{Proceedings of the 26th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/195058.195428",
	isbn          = "0-89791-663-8",
	pages         = "668--675",
	publisher     = "{ACM}",
	title         = "{Two heads are better than two tapes}",
	year          = 1994,
}