Generalizing Database Relational Algebra for the Treatment of Incomplete/Uncertain Information and Vague Queries

@article{Prade1984GeneralizingDR,
  title={Generalizing Database Relational Algebra for the Treatment of Incomplete/Uncertain Information and Vague Queries},
  author={Henri Prade and Claudette Testemale},
  journal={Inf. Sci.},
  year={1984},
  volume={34},
  pages={115-143}
}
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