@inproceedings{RTA-1998-Levy,
	author        = "Jordi Levy",
	booktitle     = "{Proceedings of the Ninth International Conference on Rewriting Techniques and Applications}",
	doi           = "10.1007/BFb0052360",
	editor        = "Tobias Nipkow",
	isbn          = "3-540-64301-X",
	pages         = "47--60",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Decidable and Undecidable Second-Order Unification Problems}",
	volume        = 1379,
	year          = 1998,
}