@inproceedings{Houghton06:effect,
  title = "The Effect of Constraint Representation on Structural Tractability",
  author = "Chris Houghton and David A. Cohen and Martin J. Green",
  year = "2006",
  booktitle = "Proceedings of the 12th International Conference on Principles and Practice of Constraint Programming (CP'06)",
  pages = "726-730",
  series = "Lecture Notes in Computer Science",
  volume = "4204",
  doi = "10.1007/11889205_59",
}