@article{Cohen04:tractable,
  title = "Tractable Decision for a Constraint Language Implies Tractable Search",
  author = "David A. Cohen",
  year = "2004",
  journal = "Constraints",
  number = "3",
  pages = "219--229",
  url = "http://www.springerlink.com/content/v21231p3601625v4/",
  volume = "9",
}