Relational algebra (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Relational algebra" in English language version.

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3books.google.com

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2semanticscholar.org

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acm.org

amturing.acm.org

C. J. Date. "Edgar F. Codd - A.M. Turing Award Laureate". amturing.acm.org. Retrieved 2020-12-27.

books.google.com

M. Tamer Özsu; Patrick Valduriez (2011). Principles of Distributed Database Systems (3rd ed.). Springer. p. 46. ISBN 978-1-4419-8833-1.
Patrick O'Neil; Elizabeth O'Neil (2001). Database: Principles, Programming, and Performance, Second Edition. Morgan Kaufmann. p. 120. ISBN 978-1-55860-438-4.
C. J. Date (2011). SQL and Relational Theory: How to Write Accurate SQL Code. O'Reilly Media, Inc. pp. 133–135. ISBN 978-1-4493-1974-8.

doi.org

Codd, E.F. (June 1970). "A Relational Model of Data for Large Shared Data Banks". Communications of the ACM. 13 (6): 377–387. doi:10.1145/362384.362685. S2CID 207549016.
Aho, Alfred V.; Jeffrey D. Ullman (1979). "Universality of data retrieval languages". Proceedings of the 6th ACM SIGACT-SIGPLAN Symposium on Principles of Programming Languages: 110–119. doi:10.1145/567752.567763. S2CID 3242505.

semanticscholar.org

api.semanticscholar.org

Codd, E.F. (June 1970). "A Relational Model of Data for Large Shared Data Banks". Communications of the ACM. 13 (6): 377–387. doi:10.1145/362384.362685. S2CID 207549016.
Aho, Alfred V.; Jeffrey D. Ullman (1979). "Universality of data retrieval languages". Proceedings of the 6th ACM SIGACT-SIGPLAN Symposium on Principles of Programming Languages: 110–119. doi:10.1145/567752.567763. S2CID 3242505.

worldcat.org

Silberschatz, Abraham; Henry F. Korth; S. Sudarshan (2020). Database system concepts (Seventh ed.). New York. p. 56. ISBN 978-0-07-802215-9. OCLC 1080554130.{{cite book}}: CS1 maint: location missing publisher (link)