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Hebrard, E. and Marx, D. and O'Sullivan, B. and Razgon, Igor (2011) Soft constraints of difference and equality. Journal of Artificial Intelligence Research 41 , pp. 97-130. ISSN 1076-9757.
Hebrard, E. and Marx, D. and O’Sullivan, B. and Razgon, Igor (2009) Constraints of difference and equality: a complete taxonomic characterisation. In: Gent, I.P. (ed.) Principles and Practice of Constraint Programming - CP 2009. Lecture Notes in Computer Science 5732. Berlin, Germany: Springer Verlag, pp. 424-438. ISBN 9783642042447.
Hebrard, E. and O’Sullivan, B. and Razgon, Igor (2008) A soft constraint of equality: complexity and approximability. In: Stuckey, P.J. (ed.) Principles and Practice of Constraint Programming. Lecture Notes in Computer Science 5202. Berlin, Germany: Springer Verlag, pp. 358-371. ISBN 9783540859581.