@inproceedings{DerivationOfConstraint,
  title = "Derivation of Constraints and Database Relations",
  author = "D.A.Cohen and M.Gyssens and P.G.Jeavons",
  year = "1996",
  booktitle = "Proceedings of the 2nd International Conference on Principles and Practice of Constraint Programming (CP96)",
  pages = "134--148",
  series = "Lecture Notes in Computer Science",
  url = "ftp://ftp.cs.rhul.ac.uk/pub/constraints/derivation.ps",
  volume = "1118",
  doi = "10.1007/3-540-61551-2_71",
}