A relational model of data for large shared data banks
Communications of the ACM
The structure of the “THE”-multiprogramming system
Communications of the ACM
SEQUEL: A structured English query language
SIGFIDET '74 Proceedings of the 1974 ACM SIGFIDET (now SIGMOD) workshop on Data description, access and control
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We recognize the need to build a facility to respond to a requirement for information systems for two classes of application areas: 1) Areas where the problem addressed and the underlying data structures keep changing (e.g. energy policy making applications). 2) Information systems in their formulative stages, where the system definition changes as the problem is better understood.