@inproceedings{ESOP-1990-NielsonN,
	author        = "Hanne Riis Nielson and Flemming Nielson",
	booktitle     = "{Proceedings of the Third European Symposium on Programming}",
	doi           = "10.1007/3-540-52592-0_70",
	editor        = "Neil D. Jones",
	isbn          = "3-540-52592-0",
	pages         = "291--305",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Eureka Definitions for Free! or Disagreement Points for Fold/Unford Transformations}",
	volume        = 432,
	year          = 1990,
}