The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
On the semantics of the relational data model
SIGMOD '75 Proceedings of the 1975 ACM SIGMOD international conference on Management of data
New Criteria for the Conceptual Model
Systems for Large Data Bases
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It is argued that the conceptual schema should contain an ontological subschema (i.e. a "reality" model). It is shown how one particular ontological meta-model can be interfaced to meta-models for the development of software requirement specifications. Through an example it is indicated how the ontological model can provide a basis for proving semantical equivalence/difference of databases.