@inproceedings{ijcai1995p85,
  title     = {Sparse Constraint Graphs and Exceptionally Hard Problems},
  author    = {Smith, Barbara M. and Grant, Stuart A.},
  booktitle = {Proceedings of the Fourteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-95}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Chris S. Mellish},
  pages     = {646--653},
  year      = {1995},
  note      = {Constraint Satisfaction},
  url       = {https://ijcai.org/proceedings/1995/85},
}