@inproceedings{STOC-1972-Savitch,
	author        = "Walter J. Savitch",
	booktitle     = "{Proceedings of the Fourth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800152.804908",
	pages         = "151--156",
	publisher     = "{ACM}",
	title         = "{Maze Recognizing Automata}",
	year          = 1972,
}