Symmetry Breaking as a Prelude to Implied Constraints: A Constraint Modelling Pattern. Frisch, A. M., Jefferson, C., & Miguel, I. In Proceedings of the 16th European Conference on Artifical Intelligence, pages 171--175, 2004.
bibtex   
@inproceedings{ Frisch+Jefferson+others/04/Symmetry,
  author    = {Alan M. Frisch and Christopher Jefferson and Ian Miguel},
  title     = {Symmetry Breaking as a Prelude to Implied Constraints: A Constraint Modelling Pattern},
  booktitle   = {Proceedings of the 16th European Conference on Artifical Intelligence},
  pages   = {171--175} ,
  year   = {2004}
}

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