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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.
Razgon, Igor and O’Sullivan, B. (2008) Almost 2-SAT is fixed-parameter tractable (extended abstract). In: Aceto, L. and Damgård, I. and Goldberg, L.A. and Halldórsson, M.M. and Ingólfsdóttir, A. and Walukiewicz, I. (eds.) Automata, Languages and Programming. Lecture Notes in Computer Science 5125. Berlin, Germany: Springer Verlag, pp. 551-562. ISBN 9783540705758.
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.