Nulls in Relational Databases: Revisited.

@article{DBLP:journals/sigmod/Kocharekar89,
  author    = {Raju Kocharekar},
  title     = {Nulls in Relational Databases: Revisited},
  journal   = {SIGMOD Record},
  volume    = {18},
  number    = {1},
  year      = {1989},
  pages     = {68-73},
  ee        = {http://doi.acm.org/10.1145/382272.382416, db/journals/sigmod/Kocharekar89.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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