@inproceedings{Gibbons&Jones98:Underappreciated,
  title = "The Under-Appreciated Unfold",
  author = "Jeremy Gibbons and Geraint Jones",
  year = "1998",
  address = "Baltimore, Maryland",
  booktitle = "International Conference on Functional Programming",
  month = "sep",
  pages = "273--279",
  url = "http://www.cs.ox.ac.uk/people/jeremy.gibbons/publications/unfold.ps.gz",
}