Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
A unified approach to functional dependencies and relations
SIGMOD '75 Proceedings of the 1975 ACM SIGMOD international conference on Management of data
Teaching data base concepts using APL
APL '75 Proceedings of seventh international conference on APL
Specifying queries as relational expressions
SIGPLAN '73 Proceedings of the 1973 meeting on Programming languages and information retrieval
A multi-level architecture for relational data base systems
VLDB '75 Proceedings of the 1st International Conference on Very Large Data Bases
An overview of recent data base research
ACM SIGMIS Database
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Data Base Management Systems (DBMS's) can be divided in three main categories according to the basic data organization offered to their users. The three approaches are: hierarchical, network and relational. In future DBMS's all views may have to be offered to please a diverse population of users. Acknowledging this requirement a common facility has often been proposed under the name of a conceptual schema. The conceptual schema comprises a common denominator for all three DBMS approaches.