An extension to the relational model for indefinite databases
ACM '87 Proceedings of the 1987 Fall Joint Computer Conference on Exploring technology: today and tomorrow
Indefinite and maybe information in relational databases
ACM Transactions on Database Systems (TODS)
Towards a relational model for exclusively disjunctive information
CSC '93 Proceedings of the 1993 ACM conference on Computer science
Logic and Databases: A Deductive Approach
ACM Computing Surveys (CSUR)
Combining Multiple Knowledge Bases
IEEE Transactions on Knowledge and Data Engineering
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