@inproceedings{STOC-1970-Ellis,
	author        = "Clarence A. Ellis",
	booktitle     = "{Proceedings of the Second Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800161.805165",
	pages         = "198--205",
	publisher     = "{ACM}",
	title         = "{Probabilistic Tree Automata}",
	year          = 1970,
}