@inproceedings{CADE-1982-SiekmannS,
	author        = "Jörg H. Siekmann and Peter Szabó",
	booktitle     = "{Proceedings of the Sixth International Conference on Automated Deduction}",
	doi           = "10.1007/BFb0000071",
	isbn          = "3-540-11558-7",
	pages         = "369--389",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Universal Unification and a Classification of Equational Theories}",
	volume        = 138,
	year          = 1982,
}