The category concept: an extension to the entity-relationship model
Data & Knowledge Engineering
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
Logic and Databases: A Deductive Approach
ACM Computing Surveys (CSUR)
A relational model of data for large shared data banks
Communications of the ACM
Logic and Data Bases
Data bases: A logical perspective
Proceedings of the 1980 workshop on Data abstraction, databases and conceptual modeling
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