@techreport{zcj08arx,
  title = "The Expressive Power of Binary Submodular Functions",
  author = "Stanislav \v{Z}ivn\'y and David A. Cohen and Peter G. Jeavons",
  year = "2008",
  note = "arXiv:0811.1885 [cs.DM]",
  url = "http://arxiv.org/abs/0811.1885",
}