@article{Gibbons2000:Generic,
  title = "Generic Downwards Accumulations",
  author = "Jeremy Gibbons",
  year = "2000",
  journal = "Science of Computer Programming",
  pages = "37--65",
  url = "http://www.cs.ox.ac.uk/people/jeremy.gibbons/publications/genda.ps.gz",
  volume = "37",
}