An Extension of the Database Language SQL to Capture More Relational Concepts.

@article{DBLP:journals/sigmod/VossenY88,
  author    = {Gottfried Vossen and
               Jim Yacabucci},
  title     = {An Extension of the Database Language SQL to Capture More Relational
               Concepts},
  journal   = {SIGMOD Record},
  volume    = {17},
  number    = {4},
  year      = {1988},
  pages     = {70-78},
  ee        = {http://doi.acm.org/10.1145/61733.61739, db/journals/sigmod/VossenY88.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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