@inbook{jz12,
  title = "Tractable valued constraints",
  author = "Peter G. Jeavons and Stanislav \v{Z}ivn\'y",
  year = "2012",
  booktitle = "Tractability: Practical Approaches to Hard Problems",
  editor = "Lucas Bordeaux and Youssef Hamadi and Pushmeet Kohli and Robert Mateescu",
  note = "This work is in copyright. The draft is for personal use only. No further distribution without permission.",
  publisher = "Cambridge University Press",
  url = "http://zivny.cz/publications/jz12cup-draft.pdf",
}