External Links

    Journal: Data \& Knowledge Engineering

    Volume 20, Issue 1

    1 -- 37Veda C. Storey, Heng-Li Yang, Robert C. Goldstein. Semantic Integrity Constraints in Knowledge-Based Database Design Systems
    39 -- 85L. J. Campbell, Terry A. Halpin, Henderik Alex Proper. Conceptual Schemas with Abstractions: Making Flat Conceptual Schemas More Comprehensible
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