@inproceedings{Calvanese-etal98,
  author	= {Calvanese and others},
  editor	= {Franconi, Enrico and Giacomo, Giuseppe De and MacGregor, Robert M. and Nutt, Werner and Welty, Christopher},
  title		= {Semi-structured data with constraints and incomplete information},
  booktitle	= {Proceedings of the 1998 International Workshop on Description Logics (DL'98)},
  year		= {1998},
  address	= {IRST, Povo-Trento, Italy}
}