@inproceedings{ijcai2003p30,
  title     = {A Maximal Tractable Class of Soft Constraints},
  author    = {Cohen, David A. and Cooper, Martin C. and Jeavons, Peter and Krokhin, Andrei A.},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  pages     = {209--213},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/30},
}