@unpublished{HiHaJa12,
  title = "Functional Pearl: F for Functor",
  author = "Hinze, Ralf and Hackett, Jennifer and James, Daniel W. H.",
  year = "2012",
  month = "March",
  note = "Submitted to ICFP '12",
  url = "http://www.cs.ox.ac.uk/people/daniel.james/functor.html",
}