@inproceedings{ICALP-1986-HartmanisH,
	author        = "Juris Hartmanis and Lane A. Hemachandra",
	booktitle     = "{Proceedings of the 13th International Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/3-540-16761-7_62",
	isbn          = "3-540-16761-7",
	pages         = "123--135",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Complexity Classes Without Machines: On Complete Languages for UP}",
	volume        = 226,
	year          = 1986,
}