Bibliografía básica C. Baral (2003). Knowledge Representation, Reasoning and Declarative Problem Solving. Cambridge University Press
K. R. Apt and R. Bol (1994). Logic Programming and negation: a survey. Journal of Logic Programming 19-20, pp. 9-71
I. Bratko (2001). Prolog Programming for Artificial Intelligence (3rd ed). Addison-Wesley

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