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Dyfyniad Arddull ChicagoCohen, D., P. Jeavons, and S. Živný. The Expressive Power of Valued Constraints: Hierarchies and Collapses. Springer, 2007.
Dyfyniad MLACohen, D., et al. The Expressive Power of Valued Constraints: Hierarchies and Collapses. Springer, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.