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
Specifying queries as relational expressions: the SQUARE data sublanguage
Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
On the semantics of the relational data model
SIGMOD '75 Proceedings of the 1975 ACM SIGMOD international conference on Management of data
LSL: a Link and Selector Language
SIGMOD '76 Proceedings of the 1976 ACM SIGMOD international conference on Management of data
SEQUEL: A structured English query language
SIGFIDET '74 Proceedings of the 1974 ACM SIGFIDET (now SIGMOD) workshop on Data description, access and control
Data architecture and data model considerations
AFIPS '77 Proceedings of the June 13-16, 1977, national computer conference
Data structures and data accessing in data base systems past, present, future
IBM Systems Journal
An overview of recent data base research
ACM SIGMIS Database
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This paper classifies a collection of conceptual data models within a taxonomy framework consisting of the following parameters: graph theoretic versus set theoretic models, mathematical foundations, terminology, and semantic levels of abstraction.