Green09'

@inproceedings{DBLP:conf/icdt/Green09,
  author    = {Todd J. Green},
  title     = {Containment of conjunctive queries on annotated relations},
  booktitle = {ICDT},
  year      = {2009},
  pages     = {296-309},
  ee        = {http://doi.acm.org/10.1145/1514894.1514930},
  crossref  = {DBLP:conf/icdt/2009},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/icdt/2009,
  editor    = {Ronald Fagin},
  title     = {Database Theory - ICDT 2009, 12th International Conference,
               St. Petersburg, Russia, March 23-25, 2009, Proceedings},
  booktitle = {ICDT},
  publisher = {ACM},
  series    = {ACM International Conference Proceeding Series},
  volume    = {361},
  year      = {2009},
  isbn      = {978-1-60558-423-2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}