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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.
Wood, Peter (2000) On the equivalence of XML patterns. In: Lloyd, J.W. and Dahl, V. and Furbach, U. and Kerber, M. and Lau, K.-K. and Palamidessi, C. and Pereira, L.M. and Sagiv, Y. and Stuckey, P.J. (eds.) CL 2000: Computational Logic. Lecture Notes in Computer Science 1861. Springer, pp. 1152-1166. ISBN 9783540449577.