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
Relational database: a practical foundation for productivity
Communications of the ACM
Case Method: Entity Relationship Modelling
Case Method: Entity Relationship Modelling
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The paper treats the developing of the semantic data models. On this basis the place and the function of PER model (processes, entity, relations) are traced.