@inproceedings{STOC-1970-Nivat,
	author        = "Maurice Nivat",
	booktitle     = "{Proceedings of the Second Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800161.805168",
	pages         = "221--225",
	publisher     = "{ACM}",
	title         = "{On Some Families of Languages Related to the Dyck Language}",
	year          = 1970,
}