@article{ContinuousAnalogues,
  title = "Continuous analogues of axiomatised digital surfaces",
  author = "A. W. Roscoe and T.Y. Kong",
  year = "1985",
  journal = "{Computer Vision, Graphics and Image Processing}",
  month = "January",
  number = "29",
  pages = "60--86",
  url = "http://www.cs.ox.ac.uk/people/bill.roscoe/publications/6.pdf",
}