@techreport{3925,
  title = "An Algebraic Theory of Complexity for Valued Constraints: Establishing a Galois Connection",
  author = "David A. Cohen and Paidi Creed and Peter G. Jeavons and Stanislav Zivny",
  year = "2010",
  institution = "OUCL",
  month = "November",
  number = "RR-10-16",
  pages = "30",
}