A Straightforward Formalization of the Relational Model.

@article{DBLP:journals/sigmod/NiemiJ84,
  author    = {Timo Niemi and
               Kalervo J{\"a}rvelin},
  title     = {A Straightforward Formalization of the Relational Model},
  journal   = {SIGMOD Record},
  volume    = {14},
  number    = {1},
  year      = {1984},
  pages     = {15-38},
  ee        = {http://doi.acm.org/10.1145/984540.984542, db/journals/sigmod/NiemiJ84.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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