@book{z12:complexity,
  title = "The complexity of valued constraint satisfaction problems",
  author = "Stanislav \v{Z}ivn\'y",
  year = "2012",
  isbn = "978-3-642-33973-8",
  publisher = "Springer",
  series = "Cognitive Technologies",
  doi = "10.1007/978-3-642-33974-5",
}