@inproceedings{STOC-1979-TouegU,
	author        = "Sam Toueg and Jeffrey D. Ullman",
	booktitle     = "{Proceedings of the 11th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800135.804402",
	pages         = "89--98",
	publisher     = "{ACM}",
	title         = "{Deadlock-Free Packet Switching Networks}",
	year          = 1979,
}