@inproceedings{ijcai2005p120,
  title     = {A Simple Model to Generate Hard Satisfiable Instances},
  author    = {Xu, Ke and Boussemart, Frédéric and Hemery, Fred and Lecoutre, Christophe},
  booktitle = {Proceedings of the Nineteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-05}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  pages     = {337--341},
  year      = {2005},
  url       = {https://ijcai.org/proceedings/2005/120},
}