@article{Gibbons96:Computing,
  title = "Computing Downwards Accumulations on Trees Quickly",
  author = "Jeremy Gibbons",
  year = "1996",
  journal = "Theoretical Computer Science",
  note = "Earlier version appeared in Proceedings of the 16th Australian Computer Science Conference, Brisbane, 1993",
  number = "1",
  pages = "67--80",
  url = "http://www.cs.ox.ac.uk/people/jeremy.gibbons/publications/quickly.ps.gz",
  volume = "169",
}