Cohen, D., Jeavons, P., & Živný, S. (2007). The Expressive Power of Valued Constraints: Hierarchies and Collapses. Springer.
Lua i Stíl Chicago (17ú heag.)Cohen, D., P. Jeavons, agus S. Živný. The Expressive Power of Valued Constraints: Hierarchies and Collapses. Springer, 2007.
Lua MLA (9ú heag.)Cohen, D., et al. The Expressive Power of Valued Constraints: Hierarchies and Collapses. Springer, 2007.
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