@inproceedings{RTA-1997-Schulz,
	author        = "Klaus U. Schulz",
	booktitle     = "{Proceedings of the Eighth International Conference on Rewriting Techniques and Applications}",
	doi           = "10.1007/3-540-62950-5_78",
	editor        = "Hubert Comon",
	isbn          = "3-540-62950-5",
	pages         = "284--298",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Criterion for Intractability of E-unification with Free Function Symbols and Its Relevance for Combination Algorithms}",
	volume        = 1232,
	year          = 1997,
}