@inproceedings{uitbaf,
  title = "Understanding Idiomatic Traversals Backwards and Forwards",
  author = "Richard Bird and Jeremy Gibbons and Stefan Mehner and Janis Voigtlaender and Tom Schrijvers",
  year = "2013",
  booktitle = "Haskell Symposium",
  month = "sep",
  url = "http://www.comlab.ox.ac.uk/jeremy.gibbons/publications/uitbaf.pdf",
}