Merrett, T.H.
Relational information systems
Reston Publishing, 1984
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Codd, E.F.
The relational model for database management: version 2
Addison-Wesley, 1990
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Elmasri, Ramez
Fundamentals of database systems
Pearson, 2016
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Elmasri, Ramez
Fundamentals of database systems
Pearson , 2017
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Whittington, R.P.
Database systems engineering
Clarendon Press , 1988
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