Relational Completeness of Data Base Sublanguages.

@article{DBLP:persons/Codd72,
  author    = {E. F. Codd},
  title     = {Relational Completeness of Data Base Sublanguages},
  journal   = {In: R. Rustin (ed.): Database Systems: 65-98, Prentice Hall and
               IBM Research Report RJ 987, San Jose, California},
  year      = {1972},
  ee        = {db/labs/ibm/RJ987.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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