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"A relational model of data for large shared data banks" http://citeseerx.ist.psu.edu/viewdoc/download?doi=

He gives criticism of the then existing databases (hierarchical and network), then proposes the relational model and the concept of a query language (though not an actual languages - this predates SQL).

Interestingly, one of the hierarchical databases (IMS) is still going strong: http://en.wikipedia.org/wiki/Information_Management_System#H...

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