@inproceedings{STOC-1981-Chew,
	author        = "Paul Chew",
	booktitle     = "{Proceedings of the 13th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800076.802452",
	pages         = "7--18",
	publisher     = "{ACM}",
	title         = "{Unique Normal Forms in Term Rewriting Systems with Repeated Variables}",
	year          = 1981,
}