@article{cccjz13:sicomp,
  title = "An algebraic theory of complexity for discrete optimisation",
  author = "David A. Cohen and Martin C. Cooper and P\'aid\'i Creed and Peter Jeavons and Stanislav \v{Z}ivn\'y",
  year = "2013",
  journal = "SIAM Journal on Computing",
  number = "5",
  pages = "1915-1939",
  url = "http://zivny.cz/publications/cccjz13sicomp-preprint.pdf",
  volume = "42",
  doi = "10.1137/130906398",
}