@book{DBLP:books/aw/DateD92,
  author    = {C. J. Date and
               Hugh Darwen},
  title     = {Relational Database Writings 1989-1991},
  publisher = {Addison-Wesley},
  year      = {1992},
  isbn      = {0-201-54303-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}