@inproceedings{STOC-1984-Harel,
	author        = "David Harel",
	booktitle     = "{Proceedings of the 16th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800057.808708",
	pages         = "418--427",
	publisher     = "{ACM}",
	title         = "{A General Result on Infinite Trees and Its Applications}",
	year          = 1984,
}