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Negation by Default and Unstratifiable Logic Programs., and . Theor. Comput. Sci., 78 (1): 86-112 (1991)EFQ: Why-Not Answer Polynomials in Action., , and . Proc. VLDB Endow., 8 (12): 1980-1983 (2015)Positivism vs. Minimalism in Deductive Databases., and . PODS, page 123-132. ACM, (1986)Fixpoint Calculus for Querying Semistructured Data., and . WebDB, volume 1590 of Lecture Notes in Computer Science, page 78-97. Springer, (1998)Efficient Computation of General Modules for ALC Ontologies (Extended Abstract)., , , and . Description Logics, volume 3515 of CEUR Workshop Proceedings, CEUR-WS.org, (2023)Efficient Computation of General Modules for ALC Ontologies., , , and . IJCAI, page 3356-3364. ijcai.org, (2023)Efficient Extraction of EL-Ontology Deductive Modules., , and . AAAI, page 6575-6582. AAAI Press, (2023)Immutably Answering Why-Not Questions for Equivalent Conjunctive Queries., , and . TAPP, USENIX Association, (2014)Query-Based Why-Not Provenance with NedExplain., , and . EDBT, page 145-156. OpenProceedings.org, (2014)Update Programs Versus Revision Programs., and . NMELP, volume 1216 of Lecture Notes in Computer Science, page 151-170. Springer, (1996)