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Effective Implementation of Negation in Database Logic Query Languages.

, , , and . LOGIDATA+: Deductive Databases with Complex Objects, volume 701 of Lecture Notes in Computer Science, Springer, (1993)

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Adding Weak Constraints to Disjunctive Datalog., , and . APPIA-GULP-PRODE, page 557-568. (1997)Efficient Evaluation of a Class of Ordered Logic Programs., , and . Data Knowl. Eng., 23 (2): 185-214 (1997)Strong and Weak Constraints in Disjunctive Datalog., , and . LPNMR, volume 1265 of Lecture Notes in Computer Science, page 2-17. Springer, (1997)Disjunctive Ordered Logic: Semantics and Expressiveness., , and . KR, page 418-431. Morgan Kaufmann, (1998)Netlog: A Logic Query Language for Network Model Databases., , and . Data Knowl. Eng., (1991)Stable Model Checking for Disjunctive Logic Programs., , and . Logic in Databases, volume 1154 of Lecture Notes in Computer Science, page 265-278. Springer, (1996)A Deductive Environment for Dealing with Objects and Nonmonotonic Reasoning., , , and . IEEE Trans. Knowl. Data Eng., 9 (4): 539-558 (1997)A Software Platform for Services Delivery in the Public Administration., , , , , and . CAiSE Workshops (2), page 69-81. FEUP Edições, Porto, (2005)A Prototypal Environment for Collaborative Work within a Research Organization., , , , and . DEXA Workshops, page 274-279. IEEE Computer Society, (2003)Enhancing Disjunctive Logic Programming for Ontology Specification., , , and . APPIA-GULP-PRODE, page 63-74. (2003)