@inproceedings{ijcai1999p61,
  title     = {The Symmetric Alldiff Constraint},
  author    = {Régin, Jean-Charles},
  booktitle = {Proceedings of the Sixteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-99}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Thomas Dean},
  pages     = {420--424},
  year      = {1999},
  note      = {Constraint Satisfaction},
  url       = {https://ijcai.org/proceedings/1999/61},
}