@techreport{TowardsHighOrder,
  title = "Towards High Order Constraint Representations for the Frequency Assignment Problem",
  author = "N.W.Dunkin and J.E.Bater and P.G.Jeavons and D.A.Cohen",
  year = "1998",
  institution = "Royal Holloway, University of London",
  month = "June",
  number = "CSD-TR-98-05",
  url = "ftp://ftp.cs.rhul.ac.uk/pub/constraints/CSD-TR-98-05.ps",
}