@inproceedings{ijcai2013p100,
  title     = {Three Generalizations of the FOCUS Constraint},
  author    = {Narodytska, Nina and Petit, Thierry and Siala, Mohamed and Walsh, Toby},
  booktitle = {Proceedings of the Twenty-Third International Joint Conference on
               Artificial Intelligence, {IJCAI-13}},
  publisher = {AAAI Press / International Joint Conferences on Artificial Intelligence},
  editor    = {Francesca Rossi},
  pages     = {630--635},
  year      = {2013},
  month     = {8},
  url       = {https://ijcai.org/proceedings/2013/100},
}