Common Data Base Languages.

@article{DBLP:journals/db/Nijssen72,
  author    = {G. M. Nijssen},
  title     = {Common Data Base Languages},
  journal   = {DATA BASE},
  volume    = {4},
  number    = {4},
  year      = {1972},
  pages     = {7-11},
  ee        = {db/journals/db/Nijssen72.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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