@article{Gibbons*94:Efficient,
  title = "Efficient Parallel Algorithms for Tree Accumulations",
  author = "Jeremy Gibbons and Wentong Cai and David Skillicorn",
  year = "1994",
  journal = "Science of Computer Programming",
  pages = "1--18",
  url = "http://www.cs.ox.ac.uk/people/jeremy.gibbons/publications/efficient.ps.gz",
  volume = "23",
}