Cohen, David A., Jeavons, Peter G. and Živný, Stanislav (2008) The expressive power of valued constraints: Hierarchies and collapses. Theoretical Computer Science, 409 (1).
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This is a Approved version This version's date is: 6/12/2008 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/e6c5aeca-b5f7-6ecb-07a3-e11350f69a19/6/
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