Ian P. Gent, Tom Kelsey, Steve Linton, Iain McDonald, Ian Miguel, Barbara M. Smith. Conditional Symmetry Breaking. In Peter van Beek, editor, Principles and Practice of Constraint Programming - CP 2005, 11th International Conference, CP 2005, Sitges, Spain, October 1-5, 2005, Proceedings. Volume 3709 of Lecture Notes in Computer Science, pages 256-270, Springer, 2005. [doi]