@inproceedings{STOC-1980-EhrigM,
	author        = "Hartmut Ehrig and Bernd Mahr",
	booktitle     = "{Proceedings of the 12th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800141.804676",
	pages         = "281--293",
	publisher     = "{ACM}",
	title         = "{Complexity of Implementations on the Level of Algebraic Specifications}",
	year          = 1980,
}