@inproceedings{STOC-1977-Sudborough,
	author        = "Ivan Hal Sudborough",
	booktitle     = "{Proceedings of the Ninth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800105.803410",
	pages         = "208--217",
	publisher     = "{ACM}",
	title         = "{Separating Tape Bounded Auxiliary Pushdown Automata Classes}",
	year          = 1977,
}