@article{BoernerBulatovChenetal.2009,
  author    = {Ferdinand Boerner and Andrei Bulatov and Hubie Chen and Peter Jeavons and Andrei Krokhin},
  title     = {The complexity of constraint satisfaction games and QCSP},
  doi       = {10.1016/J.Ic.2009.05.003},
  url       = {http://www.sciencedirect.com/science/journal/08905401},
  year      = {2009},
}