E. F. Codd. The Relational Model for Database Management, Version 2. Addison-Wesley, 1990.
@book{Codd90, title = {The Relational Model for Database Management, Version 2}, author = {E. F. Codd}, year = {1990}, tags = {relational database, e-science, database}, researchr = {https://researchr.org/publication/Codd90}, cites = {0}, citedby = {0}, publisher = {Addison-Wesley}, isbn = {0-201-14192-2}, }