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In this paper, the authors examine the possibilities to extend the relational data model with the mechanisms that can handle imprecise, uncertain and inconsistent attribute values using fuzzy logic and fuzzy sets. They present a fuzzy relational data model which they use for fuzzy knowledge representation in relational databases that guarantees the model in 3rd normal form. They also describe the CASE tool for the fuzzy database model development which is apparently the first implementation of such a CASE tool.
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