@article{Aitken:2000:AEI,
  title = "An analysis of errors in interactive proof attempts",
  author = "S. Aitken and T. Melham",
  year = "2000",
  issn = "0953-5438",
  journal = "Interacting with Computers",
  month = "June",
  number = "6",
  pages = "565--586",
  volume = "12",
}