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Williams, H. Paul and Yan, Hong (2001) Representations of the 'all_different' predicate of constraint satisfaction in integer programming. Informs Journal on Computing, 13 (2). pp. 96-103. ISSN 1091-9856
Yan, Hong and Williams, H. Paul (2007) Convex hull representations of the at least predicate of constraint satisfaction. Operational Research working papers (LSEOR 07.97). Operational Research Group, London School of Economics and Political Science, London, UK. ISBN 9780853280538