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Calì, Andrea (2007) Querying incomplete data with logic programs: ER strikes back. In: Parent, C. and Schewe, K.D. and Storey, V.C. and Thalheim, B. (eds.) Conceptual Modeling: ER 2007. Lecture Notes in Computer Science 4801. Springer, pp. 245-260. ISBN 9783540755623.
Artale, A. and Calvanese, D. and Kontchakov, Roman and Ryzhikov, Vladislav and Zakharyaschev, M. (2007) Reasoning over extended ER models. In: Parent, C. and Schewe, K.-D. and Storey, V.S. and Thalheim, B. (eds.) Conceptual Modeling, ER 2007: 26th International Conference on Conceptual Modeling. Lecture Notes in Computer Science 4801. Springer, pp. 277-292. ISBN 9783540755623.
Levene, Mark and Loizou, G. (1995) The additivity problem for data dependencies in incomplete relational databases. In: Libkin, L. and Thalheim, B. (eds.) Semantics in Databases: Selected Papers from a Workshop. Lecture Notes in Computer Science 1358. Springer, pp. 136-169. ISBN 9783540641995.