AtzeniC81'

@inproceedings{DBLP:conf/er/AtzeniC81,
  author    = {Paolo Atzeni and
               Peter P. Chen},
  title     = {Completeness of Query Languages for the Entity-Relationship
               Model},
  booktitle = {ER},
  year      = {1981},
  pages     = {109-122},
  crossref  = {DBLP:conf/er/81},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/er/81,
  editor    = {Peter P. Chen},
  title     = {Entity-Relationship Approach to Information Modeling and
               Analysis, Proceedings of the Second International Conference
               on the Entity-Relationship Approach (ER'81), Washington,
               DC, USA, October 12-14, 1981},
  publisher = {North-Holland},
  year      = {1983},
  isbn      = {0-444-86747-3},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}