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On the tractability and intractability of consistent conjunctive query answering., , and . EDBT/ICDT Ph.D. Workshop, page 38-44. ACM, (2011)Structural characterizations of schema-mapping languages., and . Commun. ACM, 53 (1): 101-110 (2010)On Preservation under Homomorphisms and Unions of Conjunctive Queries., , and . PODS, page 319-329. ACM, (2004)Reflections on Schema Mappings, Data Exchange, and Metadata Management.. PODS, page 107-109. ACM, (2018)Foreword., and . J. ACM, 51 (1): 1 (2004)Quasi-inverses of schema mappings., , , and . ACM Trans. Database Syst., 33 (2): 11:1-11:52 (2008)A Declarative Framework for Linking Entities., , , , and . ACM Trans. Database Syst., 41 (3): 17:1-17:38 (2016)Peer data exchange., , , and . ACM Trans. Database Syst., 31 (4): 1454-1498 (2006)The Decision Problem for the Probabilities of Higher-Order Properties, and . STOC, page 425-435. ACM, (1987)Constraint Satisfaction, Bounded Treewidth, and Finite-Variable Logics., , and . CP, volume 2470 of Lecture Notes in Computer Science, page 310-326. Springer, (2002)