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Thiel, Sven Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Mehlhorn, K., & Thiel, S. (2000). Faster Algorithms for Bound-Consistency of the Sortedness and the Alldifferent Constraint. In Principles and practice of constraint programming - CP 2000 (CP-00): 6th international conference, CP 2000 (pp. 306-319). Berlin, Germany: Springer.