@book{DBLP:books/sp/CeriGT90,
  author    = {Stefano Ceri and
               Georg Gottlob and
               Letizia Tanca},
  title     = {Logic Programming and Databases},
  publisher = {Springer},
  year      = {1990},
  isbn      = {3-540-51728-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}