A relational model of data for large shared data banks. Codd, E. F Communications of the ACM, 13(6):377–387, ACM New York, NY, USA, 1970.
bibtex   
@article{codd1970relational,
  title={A relational model of data for large shared data banks},
  author={Codd, Edgar F},
  journal={Communications of the ACM},
  volume={13},
  number={6},
  pages={377--387},
  year={1970},
  publisher={ACM New York, NY, USA}
}

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