@inproceedings{RTA-1991-Baader,
	author        = "Franz Baader",
	booktitle     = "{Proceedings of the Fourth International Conference on Rewriting Techniques and Applications}",
	doi           = "10.1007/3-540-53904-2_88",
	editor        = "Ronald V. Book",
	isbn          = "3-540-53904-2",
	pages         = "86--97",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Unification, Weak Unification, Upper Bound, Lower Bound, and Generalization Problems}",
	volume        = 488,
	year          = 1991,
}