NP optimization problems in Datalog

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Key Constraints and Monotonic Aggregates in Deductive Databases

Computational Logic: Logic Programming and Beyond, Essays in Honour of Robert A. Kowalski, Part II

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Computational Logic: Logic Programming and Beyond, Essays in Honour of Robert A. Kowalski, Part II

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DEXA'06 Proceedings of the 17th international conference on Database and Expert Systems Applications